Research

Research highlights and news

AFM topological insulators

Metamagnetism of weakly coupled antiferromagnetic topological insulators MnBi₂Te₄ and MnBi₄Te₇

Phys. Rev. Lett. 124, 197201

Molecular magnet monolayers

Substrate‐independent magnetic bistability in monolayers of the single‐molecule magnet Dy₂ScN@C₈₀ on metals and insulators

Angew. Chem. Int. Ed. 59 , 5756

Turning charge-density waves into Cooper pairs

ARPES shows that by tuning the energy position of the van Hove singularity in Pd-doped 2H-TaSe₂, CDW is suppressed and superconductivity enhanced by more than an order of magnitude.

npj Quantum Materials 5, 22

Origin of superconductivity in FeSe

⁷⁷Se NMR on doped FeSe single crystals shows that superconductivity is essentially driven by spin fluctuations in the intermediate coupling regime, while nematic fluctuations have a marginal impact on Tc.

npj Quantum Materials 5, 8

Research at IFF

At the Institute for Solid State Research (German: Institut für Festkörperforschung , in short IFF) we host under one roof the synthesis and crystal growth of novel quantum- and nano-materials, a wide portfolio of experimental techniques that help us understand their physical properties, and the exploration of their potential for applications in fields from electronics to medicine. An important aspect of our work is the continuous improvement and development of experimental techniques.

Research Topics at IFF

Quantum materials

In quantum materials potential functionalities for technological applications emerge from their complex, quantum mechanical electronic properties. Such complex electronic properties may result from the interplay and unusual ordering phenomena of electronic spin, orbital and charge degrees of freedom and can be observed in the context of topologically protected spin or charge states or for particular geometries.

Material classes include certain families of transition-metal oxides, molecular solids and a range of intermetallic materials. What sets these systems apart is that their valence and conduction electrons typically retain to some extent their atomic character, resulting in a rich interplay of localized and delocalized electronic degrees of freedom. This renders these materials both practically and conceptually very different from simple metals and semiconductors with well-understood itinerant quasi-particles. Often the quantum mechanical interplay between the localized and delocalized electronic degrees of freedom leads to anomalous charge transport properties, for instance due to the presence of metal-insulator transitions, and exceptional types of ordering phenomena, such as unconventional forms of superconductivity and quantum magnetism. Functionalities that arise from this are for instance large magnetocaloric effects, high temperature superconductivity, magnetism with very strong anisotropy and colossal/giant magnetoresistance.

The plethora of spectacular and surprising phenomena that can occur in quantum materials poses one of the greatest set of challenges for cutting-edge experimental and theoretical condensed matter physics. As a rule material-specific predictions for the occurrence of many of these phenomena are very difficult, even if some of the presently booming research topics in this field, for instance the investigation of magnetic skyrmions and new topological states of matter, have emerged from a strong theoretical research effort and remain being strongly pushed by it.

Quantum materials at the nanoscale

When the dimensions of materials are restricted to the nanometer length-scale, new electronic properties emerge. This is related to the fact that any macroscopic object, when scaled down to a nanometer-scale, starts exhibiting distinct quantum mechanical properties. However, at the nanoscale also entirely new physical properties may emerge, for instance at surfaces and interfaces of topological insulators (TIs) where the spin of surface electrons is locked to their momentum, a property that is interesting in the context of spintronics.

The technological ability to engineer and shape materials at the nanoscale opens up a very well-defined road to control the materials properties and functionality in a systematic manner. It requires the synthesis, modelling and structuring of nanosystems, which is pursued in the context of a broad span of nanoparticles, ranging from endohedral fullerenes, carbon-based buckytubes to intermetallic or oxide nanoparticles. This combined approach is also the basis for the design of interfaces and heterostructures of superconducting materials, magnetic systems and molecular solids. In these heterostructures charge transfer effects at or across interfaces are decisive for the properties and functionality. An advantage of such interfaces is that they can be modified and engineered to a much greater extent than bulk Quantum Materials.

Building on the traditional strength in the field of Quantum Materials, and in order to strengthen in particular this research area and its potential for device applications, in 2013 the Center for Transport and Devices of Emergent Materials (CTD) has been founded together with the TU Dresden.

Our research teams search for new materials with the outlined unusual electronic properties and study their fundamental physical properties using a broad range of experimental techniques. Customized high resolution methodology is developed according to the specific scientific questions and phenomena, and finally, based on the experimental results, the chemistry, the morphology and the intrinsic physical properties of the materials are optimized with respect to technical applications. Some of the methodological developments of our institute push the limits of current condensed matter research. Such set-ups as well as the special infrastructure for materials synthesis are made available to cooperation partners at universities (crystal growth laboratory), worldwide users (ARPES measurement stations at the Berlin Synchrotron BESSY), or to industry partners (laboratory for spectroelectrochemistry).

Application-driven research

Based on our scientific expertise, our methodological experience, and based on our dedicated knowledge of specific materials classes, we also perform application-driven research in close cooperation with various industry partners. In many of these activities key challenges of the modern industrial and information society are addressed. For example, there are projects in cancer research based on our knowledge of molecular nanostructures.

Additionally, our specific methodology and expertise for spectroelectrochemistry, magnetic materials, and oxide nanomaterials is used in industry projects concerning energy and/or mobility. The activities on novel magnetic materials are also motivated by the urgent issues of resources and sustainability. Moreover, the industry-oriented research of our institute includes since many years the topic "Surface Acoustic Waves (SAW)" dealing with innovative micro-acoustic components and devices as well as the associated high-tech materials and technologies. The IFW-driven "SAWLab Saxony - Competence Center for Acoustoelectronic Phenomena, Technologies and Devices" aims to bundle our profound SAW knowledge with experience and demands of several small and medium-sized Saxon high-tech companies fostering the close cooperation of our institute with the regional industry.

Facilities at IFF

Electron spectroscopy and microscopy

Electron Energy Loss Spectroscopy (EELS)
Photoemission Spectroscopy (PES), low energy photons (laser, gas discharge sources) and x-rays, angle-integrated and resolved operation
Photoemission Electron Microscopy (PEEM)
Transmission Electron Microscopy (TEM)
Optical Spectroscopy

Synchrotron Methods

1-cubed-ARPES
NanoESCA -Lab-based ARPES
Bruker 4-circle x-ray diffractometer (KAPPA APEXII)
high-pressure x-ray diffraction setup
transmission EELS -TEM (JEM 2010f)

Synthesis and crystal growth

Floating zone furnaces with optical heating under pressure up to 150 bar
Bridgman-Stockbarger apparatus up to 1500°C
Bridgman-Stockbarger apparatus up to 1600°C
Hukin-type cold-crucible rf induction melting and casting device
Multianvil device for high pressure synthesis and crystal growth up to 6GPa pressure and up to 1500°C
Arc-melting devices with high vacuum conditions (~10-6mbar) and Ar gas inlet
Different tube and chamber furnaces up to 1800°C for synthesis and crystal growth
Thermoanalysis under well-defined atmospheres up to 2400°C
High-temperature optical microscope (temperature up to 1450°C)
Handling of quartz glass
Complete metallography and ceramography
Analytical scanning electron microscope EVOMA15 (Zeiss), with EDX & WDX
X-ray diffractometers: Guinier camera with image plate, Temperatures 10 K to 300 K (Huber), Laue diffraction camera, Single crystal diffractometer (Bruker KAPPA-APEX II, 30 K-1000 K)
Setup to measure nuclear magnetic resonance (NMR) in ferromagnets (TECMAG spectrometer, 0T, 1.5- 300 K, 10-500 MHz)

Transport and SPM

Electrical Transport

³He/⁴He dilution refrigerators, pumped ³He, and variable-temperature inserts
combined with high-field magnets (16 Tesla) or vector magnets (3D: 6T-2T-2T; 2D: 12T-1T)

Thermal Transport

Pumped ³He and variable-temperature inserts
300 mK to 350 K, 17 Tesla
Laser Flash Apparatus LFA 457MicroFlash
Thermal Diffusivity measurements covering 150 K to 1000 K

Scanning Probe Microscopy

Variable Temperature Scanning Tunneling Microscope (STM)
Base temperature: 30 K, UHV
High-Resolution STM
Base temperature: 300mK, UHV, 9 Tesla, equipped for spin-polarized STM
Dip-stick STM
Base temperature: 4.2K, 16 Tesla, in-situ cleaving mechanism
Room temperature Omicron UHV SEM with integrated STM
Magnetic force microscope (MFM)
Nanoscan hr-MFM (room temperature, high vacuum)

Magnetic properties

Electron spin resonance

Two tunable high-frequency high-magnetic field ESR spectrometers based on the Millimeterwave Vector Network Analyzers and millimeterwave backward oscillators
- frequency range 10 GHz - 1 THz
- magnetic fields up to 16 Tesla (up to 11 Tesla with an optical magneto-cryostat)
- Temperature range 0.3 – 300 K
Bruker 10 GHz (X-band) ESR Spectrometer(3.5 K - 300K, filed up to 1 T)

Thermodynamics

Quantum Design SQUID Magnetometer (5 T, 1.5-400 K, Oven (up to 800 K), Rotator, Ultra-Low-field option, Hydrostatic Pressure Cell up to 5 GPa)
Vibrating Sample Magnetometer (17 T, 2.5-300 K)
Alternating Gradient Magnetometer MicroMag™ Model 2900 (Princeton Measurement Corp., 4-300 K, 1.2 T, 1 nemu rms)
Quantum Design PPMS (9 T, 0.5-350 K; Specific heat, AC-susceptibility, Torque-Magnetometer, Electrical+heat transport, Dilatometer)
Quantum Design SQUID-VSM (7 T, 1.8-400 K)
Magnetostriction (18 T, 2-300K), Thermal Expansion (18 T, 2-300 K)
Hydrostatic Pressure Cell (up to 5 GPa)AC-Susceptibility (AC-Dipstick; 0 T)

In addition to the in-house techniques, in cooperation with our partners we apply the following techniques:

Pulsed Field Magnetometer up to 60 T (with J. Wosnitza, FZD Rossendorf)

Nuclear magnetic resonance

Spectrometers

3 Techmag 500 MHz Double Resonance Spektrometers
1 Tecmag LapNMR 0.2 MHz - 125 MHz single Resonance NQR

Cryostats

1 Oxford cryostat (1.5K - 500K)
3 Janis cryostats (1.5K - 325K)

Nanoscale Chemistry

Fullerenes

Four fullerene generators of local design
Full set of chromatographic (HPLC) equipment for separation of fullerene mixtures, including recycling HPLC

Spectroelectrochemistry

The Center of Spectroelectrochemistry in IFW has state-of-the-art equipment and expertise for in situ studies of the electrochemical electron transfer using IR, Raman, ESR, NMR, UV-vis-NIR and luminescence techniques. This list of spectroelectrochemical techniques available in the Center is quite unique, also on an international level.

Electrochemistry + spectroscopic method(s):

In situ ESR spectroelectrochemistry
In situ UV-vis-NIR spectroelectrochemistry
In situ ESR/UV-vis-NIR spectroelectrochemistry
In situ NMR spectroelectrochemistry
In situ Luminescence spectroelectrochemistry
In situ IR spectroelectrochemistry
In situ Raman spectroelectrochemistry

Surface dynamics

The Surface Dynamics Group possesses or has easy access to all equipment needed for the work on modern SAW systems . This includes a variety of unique and state-of-the-art tools and instruments for advanced simulation and extensive evaluation of thin films and bulk samples, as well as for the precise characterization of microacoustic devices under different ambient conditions:

Proprietary software tools for
- Searching for acoustic modes in material systems of crystal acoustics (incl. thin films and fluids) and calculation of all relevant parameters
- Extraction of material properties from BAW and SAW measurements
- Calculation of COM parameters for SAW device simulation (surface impedance method)
- SAW device simulation on base of different methods and models (surface impedance method, BAW based models)
- FEM simulation of SAW systems
Ultra high frequency vibrometer for SAW & BAW wavefield measurements (Polytec UHF-120)
Dedicated clustertool CARMEN for thin film deposition on piezo- and pyroelectric substrates for magnetron sputtering, e-beam evaporation and pre-treatment including in-situ measurement techniques
High-precision ultrasonic pulse-echo measurement system (RiTec 5000)
Customized laseracoustic devices (LAwave systems) for high-precision material characterization (bulk, thin films, temperature dependence)
Setup for high precision measurement of bulk sample mass densitity (single crystals etc.)
Brillouin light scattering measurement system (JRS)
Diverse setups for SAW-based microfluidics
In-situ measurement techniques for damage analysis on loaded SAW devices
Customized lifetime (TTF) measuring setups for SAW devices
Various ovens for thermal treatment and measurement up to 1200°C under different atmospheric conditions (vacuum, inert gas, forming gas)
Gas flow cryostats equipped for dielectric and ultrasonic measurements in the temperature range 4.2 K - 350 K
Diverse RF measurement devices up to 8.5 GHz (network analyzers, impedance/gain phase analyzers, digitizing oscilloscopes etc)
Equipment for measurement of electrical and mechanical thin film and bulk parameters (resistivity, polarization, pyroelectricity, hardness, thickness)

Publications 2020

Journal Papers

2020 - K. Maiti, T. Basu, S. Thakur, N. Sahadev, D. Biswas, G. Adhikary, Y. Xu, W. Löser, E.V. Sampathkumaran
Electronic structure studies on single crystalline Nd2PdSi3, an exotic Nd-based intermetallic: evidence for Nd 4fhybridization
Journal of Physics: Condensed Matter | Volume: 32 | Issue: 46 | P. 46LT02/1-6 | URL

2020 - M.R. Adib, V.V. Kondalkar, K. Lee
Development of Highly Sensitive Ethane Gas Sensor Based on 3D WO₃ Nanocone Structure Integrated with Low‐Powered In‐Plane Microheater and Temperature Sensor
Advanced Materials Technologies | Volume: 5 | Issue: 5 | P. 2000009/1-12 | URL

2020 - E. Thauer, A. Ottmann, P. Schneider, L. Möller, L. Deeg, R. Zeus, F. Wilhelmi, L. Schlestein, C. Neef, R. Ghunaim, M. Gellesch, C. Nowka, M. Scholz, M. Haft, S. Wurmehl, K. Wenelska, E. Mijowska, A. Kapoor, A. Bajpai, S. Hampel, R. Klingeler
Filled Carbon Nanotubes as Anode Materials for Lithium-Ion Batteries
Molecules | Volume: 25 | Issue: 5 | P. 1064/1-20 | URL

2020 - C. Habenicht, A. Lubk, R. Schuster, M. Knupfer, B. Büchner
Investigation of potassium-intercalated bulk MoS2 using transmission electron energy-loss spectroscopy
Physical Review B | Volume: 101 | Issue: 15 | P. 155429/1-12 | URL

2020 - D. Usachov, M. Güttler, S. Schulz, G. Poelchen, S. Seiro, K. Kliemt, K. Kummer, C. Krellner, C. Laubschat, E. Chulkov, D. Vyalikh
Spin structure of spin-orbit split surface states in a magnetic material revealed by spin-integrated photoemission
Physical Review B | Volume: 101 | Issue: 24 | P. 245140/1-7 | URL

2020 - F. Kirner, P. Potapov, J. Schultz, J. Geppert, M. Müller, G. González-Rubio, S. Sturm, A. Lubk, E. Sturm
Additive-controlled synthesis of monodisperse single crystalline gold nanoparticles: interplay of shape and surface plasmon resonance
Journal of Materials Chemistry C | Volume: 8 | Issue: 31 | P. 10844-10851 | URL

2020 - H. Grafe, P. Lepucki, M. Witschel, A. Dioguardi, R. Kappenberger, S. Aswartham, S. Wurmehl, B. Büchner
Unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters
Physical Review B | Volume: 101 | Issue: 5 | P. 054519/1-12 | URL

2020 - D. Takegami, D. Kasinathan, K.K. Wolff, S.G. Altendorf, C.F. Chang, K. Hoefer, A. Melendez-Sans, Y. Utsumi, F. Meneghin, T.D. Ha, C.H. Yen, K. Chen, C.Y. Kuo, Y.F. Liao, K.D. Tsuei, R. Morrow, S. Wurmehl, B. Büchner, B.E. Prasad, M. Jansen, A.C. Komarek, P. Hansmann, L.H. Tjeng
Charge-transfer energy in iridates: A hard x-ray photoelectron spectroscopy study
Physical Review B | Volume: 102 | Issue: 4 | P. 045119/1-9 | URL

2020 - A. Isaeva, M. Ruck
Crystal Chemistry and Bonding Patterns of Bismuth-Based Topological Insulators
Inorganic Chemistry | Volume: 59 | Issue: 6 | P. 3437-3451 | URL

2020 - J. Zeisner, K. Mehlawat, A. Alfonsov, M. Roslova, T. Doert, A. Isaeva, B. Büchner, V. Kataev
Electron spin resonance and ferromagnetic resonance spectroscopy in the high-field phase of the van der Waals magnet CrCl₃
Physical Review Materials | Volume: 4 | Issue: 6 | P. 064406/1-8 | URL

2020 - Y. Karpov, N. Kiriy, P. Formanek, C. Hoffmann, T. Beryozkina, M. Hambsch, M. Al-Hussein, S. Mannsfeld, B. Büchner, B. Debnath, M. Bretschneider, Y. Krupskaya, F. Lissel, A. Kiriy
Sequentially Processed P3HT/CN6-CP•−NBu4+ Films: Interfacial or Bulk Doping?
Advanced Electronic Materials | Volume: 2020 | P. 1901346/1-13 | URL

2020 - K. Manna, G. Aslan Cansever, A. Malyuk, S. Wurmehl, S. Seiro, B. Büchner
Flux growth of Sr_n+1Ir_nO_3n+1 (n = 1, 2, ∞) crystals
Journal of Crystal Growth | Volume: 540 | P. 125657/1-6 | URL

2020 - A. Kłosiński, D. Efremov, J. van den Brink, K. Wohlfeld
Photoemission spectrum of Ca₂RuO₄: Spin polaron physics in an S=1 antiferromagnet with anisotropies
Physical Review B | Volume: 101 | Issue: 3 | P. 035115/1-11 | URL

2020 - S. Gaß, P. M. Cônsoli, V. Kocsis, L. T. Corredor, P. Lampen-Kelley, D. G. Mandrus, S. E. Nagler, L. Janssen, M. Vojta, B. Büchner, A. Wolter-Giraud
Field-induced transitions in the Kitaev material α−RuCl3 probed by thermal expansion and magnetostriction
Physical Review B | Volume: 101 | Issue: 24 | P. 245158/1-13 | URL

2020 - Z. Liu, S. Thirupathaiah, A.N. Yaresko, S. Kushwaha, Q. Gibson, W. Xia, Y. Guo, D. Shen, R. Cava, S. Borisenko
A Giant Bulk‐Type Dresselhaus Splitting with 3D Chiral Spin Texture in IrBiSe
Physica Status Solidi - Rapid Research Letters | Volume: 14 | Issue: 4 | P. 1900684/1-6 | URL

2020 - N. Avraham, A. Kumar Nayak, A. Steinbok, A. Norris, H. Fu, Y. Sun, Y. Qi, L. Pan, A. Isaeva, A. Zeugner, C. Felser, B. Yan, H. Beidenkopf
Visualizing coexisting surface states in the weak and crystalline topological insulator Bi2TeI
Nature Materials | Volume: 19 | Issue: 6 | P. 610-617 | URL

2020 - P. Schütz, M. Kamp, D. Di Sante, A. Lubk, B. Büchner, G. Sangiovanni, M. Sing, R. Claessen
Electronic structure of epitaxial perovskite films in the two-dimensional limit: Role of the surface termination
Applied Physics Letters | Volume: 116 | Issue: 20 | P. 201601/1-5 | URL

2020 - S. Novikov, V. Kuznetsova, A. Burkov, J. Schumann
Dependence of the Crystallization Kinetics of Cr_0.26Si_0.74 Thin Films on Their Thickness
Semiconductors | Volume: 54 | Issue: 4 | P. 426-428 | URL

2020 - A.P. Dioguardi, S. Selter, U. Peeck, S. Aswartham, M.-I. Sturza, R. Murugesan, M.S. Eldeeb, L. Hozoi, B. Büchner, H.-J. Grafe
Quasi-two-dimensional magnetic correlations in Ni₂P₂S₆ probed by ³¹P NMR
Physical Review B | Volume: 102 | Issue: 6 | P. 064429/1-16 | URL

2020 - S. Intorp, M. Hodecker, M. Müller, O. Tverskoy, M. Rosenkranz, E. Dmitrieva, A. Popov, F. Rominger, J. Freudenberg, A. Dreuw, U. Bunz
Quinoidal Azaacenes: 99% Diradical Character
Angewandte Chemie - International Edition | Volume: 59 | Issue: 30 | P. 12396-12401 | URL

2020 - M. Hantusch, R. Kuhrt, M. Knupfer
Photoelectron Spectroscopy on Polycyclic Hydrocarbon–F6TCNNQ Interfaces
The Journal of Physical Chemistry C | Volume: 124 | Issue: 5 | P. 2961−2967 | URL

2020 - L. Spree, C. Schlesier, A. Kostanyan, R. Westerström, T. Greber, B. Büchner, S. Avdoshenko, A. Popov
Single‐Molecule Magnets DyM₂N@C₈₀ and Dy₂MN@C₈₀ (M=Sc, Lu): The Impact of Diamagnetic Metals on Dy³⁺ Magnetic Anisotropy, Dy⋅⋅⋅Dy Coupling, and Mixing of Molecular and Lattice Vibrations
Chemistry - A European Journal | Volume: 26 | Issue: 11 | P. 2436-2449 | URL

2020 - M. Vogl, R. Morrow, A. Aczel, R. Beltran Rodriguez, A. Wolter-Giraud, S. Wurmehl, S. Aswartham, B. Büchner
Complex magnetic properties in the mixed 4f−5d double perovskite iridates X2ZnIrO6(X=Nd,Sm,Eu,Gd)
Physical Review Materials | Volume: 4 | Issue: 5 | P. 054413/1-10 | URL

2020 - M.I. Sturza, M.L. Amigó, J.I. Facio, F. Caglieris, S. Aswartham, S. Seiro, C. Hess, J. van den Brink, S. Wurmehl, B. Büchner
La₆Pd_2+xSb₁₅ (x = 0.28): A rare-earth palladium intermetallic compound with extended pnictogen ribbons
Journal of Solid State Chemistry | Volume: 291 | P. 121578 | URL

2020 - I. Kar, J. Chatterjee, L. Harnagea, Y. Kushnirenko, A. Fedorov, D. Shrivastava, B. Büchner, P. Mahadevan, S. Thirupathaiah
Metal-chalcogen bond-length induced electronic phase transition from semiconductor to topological semimetal in ZrX₂ (X=Se and Te)
Physical Review B | Volume: 101 | Issue: 16 | P. 165122/1-10 | URL

2020 - S. Changdar, S. Aswartham, A. Bose, Y. Kushnirenko, G. Shipunov, N.C. Plumb, M. Shi, A. Narayan, B. Büchner, S. Thirupathaiah
Electronic structure studies of FeSi: A chiral topological system
Physical Review B | Volume: 101 | Issue: 23 | P. 235105/1-8 | URL

2020 - J. Melidonie, E. Dmitrieva, K. Zhang, Y. Fu, A.A. Popov, W. Pisula, R. Berger, J. Liu, X. Feng
Dipyrene-Fused Dicyclopenta[a,f]naphthalenes
The Journal of Organic Chemistry | Volume: 85 | Issue: 1 | P. 215-223 | URL

2020 - S. Rößler, L. Jiao, S. Seiro, P. Rosa, Z. Fisk, U.K. Rößler, S. Wirth
Visualization of localized perturbations on a (001) surface of the ferromagnetic semimetal EuB6
Physical Review B | Volume: 101 | Issue: 23 | P. 235421/1-9 | URL

2020 - N. Kumar, M. Yao, J. Nayak, M. Vergniory, J. Bannies, Z. Wang, N. Schröter, V. Strocov, L. Müchler, W. Shi, E.D.L. Rienks, J. Mañes, C. Shekhar, S. Parkin, J. Fink, G. Fecher, Y. Sun, B. Bernevig, C. Felser
Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb₂
Advanced Materials | Volume: 32 | Issue: 11 | P. 1906046/1-6 | URL

2020 - E.M.M. Ibrahim, G.A. Ahmed, V. Khavrus, N.M. Hadia, S.H. Mohamed, S. Hampel, A.M. Adam
Tailoring the thermoelectric properties of Pb1-xSmxTe nanostructures via Sm doping
Intermetallics | Volume: 125 | P. 106923/ | URL

2020 - L. Möller, E. Thauer, A. Ottmann, L. Deeg, R. Ghunaim, S. Hampel, R. Klingeler
CoFe₂O₄-filled carbon nanotubes as anode material for lithium-ion batteries
Journal of Alloys and Compounds | Volume: 834 | P. 155018 | URL

2020 - F. Roth, A. Revcolevschi, B. Büchner, M. Knupfer, J. Fink
Evidence for an orbital dependent Mott transition in the ladders of (La,Ca)xSr14−xCu24O41 derived by electron energy loss spectroscopy
Physical Review B | Volume: 101 | Issue: 19 | P. 195132/1-8 | URL

2020 - I.O. Cherniavskii, S.E. Nikitin, Y.A. Onykiienko, D.S. Inosov, Q. Stahl, J. Geck, X.C. Hong, C. Hemker-Heß, S. Gaß, A.U.B. Wolter-Giraud, D. Wolf, A. Lubk, D.V. Efremov, F. Yokaichiya, S. Aswartham, B. Büchner, I.V. Morozov
Incommensurate magnet iron monophosphide FeP: Crystal growth and characterization
Physical Review Materials | Volume: 4 | Issue: 8 | P. 083403/1-9 | URL

2020 - J. Lucassen, C. Schippers, M. Verheijen, P. Fritsch, E. Geluk, B. Barcones, R. Duine, S. Wurmehl, H. Swagten, B. Koopmans, R. Lavrijsen
Extraction of Dzyaloshinskii-Moriya interaction from propagating spin waves
Physical Review B | Volume: 101 | Issue: 6 | P. 064432/1-6 | URL

2020 - A. Pykhova, O. Semivrazhskaya, N.S. Samoylova, A. Rybalchenko, M. Rosenkranz, I. Ioffe, A.A. Popov, A. Goryunkov
Addition of CF2 group to endohedral fullerene Sc3N@Ih-C80
Dalton Transactions | Volume: 49 | Issue: 26 | P. 9137-9147 | URL

2020 - A. Chikina, A. Fedorov, D. Bhoi, V. Voroshnin, E. Haubold, Y. Kushnirenko, K. Kim, S. Borisenko
Turning charge-density waves into Cooper pairs
NPJ Quantum Materials | Volume: 5 | Issue: 1 | P. 22/ | URL

2020 - R. Morrow, M. Sturza, R. Ray, C. Himcinschi, J. Kern, P. Schlender, M. Richter, S. Wurmehl, B. Büchner
Discovery, Crystal Growth, and Characterization of Garnet Eu₂PbSb₂Zn₃O₁₂
European Journal of Inorganic Chemistry | Volume: 2020 | Issue: 26 | P. 2512-2520 | URL

2020 - R. Weser, A. Darinskii, M. Weihnacht, H. Schmidt
Experimental and numerical investigations of mechanical displacements in surface acoustic wave bounded beams
Ultrasonics | Volume: 106 | P. 106077/1-10 | URL

2020 - A. Tan, V. Labracherie, N. Kunchur, A. Wolter-Giraud, J. Cornejo, B. Büchner, J. Dufouleur, A. Isaeva, R. Giraud
Metamagnetism of Weakly Coupled Antiferromagnetic Topological Insulators
Physical Review Letters | Volume: 124 | Issue: 19 | P. 197201/1-6 | URL

2020 - X. Wang, B. Valldor, E. Spielberg, F. Heinemann, K. Meyer, A. Mudring
Paramagnetic iron-containing ionic liquid crystals
Journal of Molecular Liquids | Volume: 304 | P. 112583/1-9 | URL

2020 - M. Ajayakumar, Y. Fu, F. Liu, H. Komber, V. Tkachova, C. Xu, S. Zhou, A.A. Popov, J. Liu, X. Feng
Tailoring Magnetic Features in Zigzag‐Edged Nanographenes by Controlled Diels–Alder Reactions
Chemistry – A European Journal | Volume: 26 | Issue: 33 | P. 7497-7503 | URL

2020 - D. Krylov, S. Schimmel, V. Dubrovin, F. Liu, T.T.N. Nguyen, L. Spree, C. Chen, G. Velkos, C. Bulbucan, R. Westerström, M. Studniarek, J. Dreiser, C. Heß, B. Büchner, S. Avdoshenko, A.A. Popov
Substrate-Independent Magnetic Bistability in Monolayers of the Single-Molecule Magnet Dy₂ScN@C₈₀ on Metals and Insulators
Angewandte Chemie - International Edition | Volume: 59 | Issue: 14 | P. 5756-5764 | URL

2020 - S.O. Filnov, I.I. Klimovskikh, D.A. Estyunin, A.V. Fedorov, V.Yu. Voroshnin, A.V. Koroleva, A.G. Rybkin, E.V. Shevchenko, Z.S. Aliev, M.B. Babanly, I.R. Amiraslanov, N.T. Mamedov, E.F. Schwier, K. Miyamoto, T. Okuda, S. Kumar, A. Kimura, V.M. Misheneva, A.M. Shikin, E.V. Chulkov
Probe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi_0.9Gd_0.1Se₂
Physical Review B | Volume: 102 | Issue: 8 | P. 085149/1-7 | URL

2020 - T. Li, V.K. Bandari, M. Hantusch, J. Xin, R. Kuhrt, R. Ravishankar, L. Xu, J. Zhang, M. Knupfer, F. Zhu, D. Yan, O.G. Schmidt
Integrated molecular diode as 10 MHz half-wave rectifier based on an organic nanostructure heterojunction
Nature Communications | Volume: 11 | Issue: 1 | P. 3592/1-10 | URL

2020 - R. Weser, A. Winkler, M. Weihnacht, S. Menzel, H. Schmidt
The complexity of surface acoustic wave fields used for microfluidic applications
Ultrasonics | Volume: 106 | P. 106160/1-12 | URL

2020 - G. Velkos, W. Yang, Y.-R. Yao, S.M. Sudarkova, X.Y. Liu, B. Büchner, S.M. Avdoshenko, N. Chen, A.A. Popov
Shape-adaptive single-molecule magnetism and hysteresis up to 14 K in oxide clusterfullerenes Dy₂O@C₇₂ and Dy₂O@C₇₄ with fused pentagon pairs and flexible Dy–(μ2-O)–Dy angle
Chemical Science | Volume: 11 | Issue: 18 | P. 4766–4772 | URL

2020 - R. Kuhrt, M. Hantusch, M. Knupfer, B. Büchner
Charge transfer characteristics of F 6 TCNNQ–gold interface
Surface and Interface Analysis | P. 1-4 | URL

2020 - A. Pavlis, X. Zotos
Dressed excitations, thermodynamics and relaxation in the XXZ Heisenberg model
Journal of Statistical Mechanics: Theory and Experiment | Volume: 2020 | Issue: 1 | P. 013101/1-22 | URL

2020 - C. Habenicht, J. Simon, M. Richter, R. Schuster, M. Knupfer, B. Büchner
Potassium-intercalated bulk HfS₂ and HfSe₂: Phase stability, structure, and electronic structure
Physical Review Materials | Volume: 4 | Issue: 6 | P. 064002/1-21 | URL

2020 - M. Scholz, Y. Hayashi, V. Eckert, V. Khavrus, A. Leonhardt, B. Büchner, M. Mertig, S. Hampel
Systematic Investigations of Annealing and Functionalization of Carbon Nanotube Yarns
Molecules | Volume: 25 | Issue: 5 | P. 1144/1-14 | URL

2020 - M. Korb, X. Liu, S. Walz, M. Rosenkranz, E. Dmitrieva, A. Popov, H. Lang
(Electrochemical) Properties and Computational Investigations of Ferrocenyl-substituted Fe₃(μ₃-PFc)₂(CO)₉ and Co₄(μ₄-PFc)₂(CO)₉ Clusters and Their Reduced Species
Inorganic Chemistry | Volume: 59 | Issue: 9 | P. 6147–6160 | URL

2020 - S. Muratović, B. Karadeniz, T. Stolar, S. Lukin, I. Halasz, M. Herak, G. Mali, Y. Krupskaya, V. Kataev, D. Žilić, K. Užarević
Impact of dehydration and mechanical amorphization on the magnetic properties of Ni(II)-MOF-74
Journal of Materials Chemistry C | Volume: 8 | Issue: 21 | P. 7132-7142 | URL

2020 - J. Ma, Y. Fu, E. Dmitrieva, F. Liu, H. Komber, F. Hennersdorf, A.A. Popov, J. Weigand, J. Liu, X. Feng
Helical Nanographenes Containing an Azulene Unit: Synthesis, Crystal Structures, and Properties
Angewandte Chemie - International Edition | Volume: 59 | Issue: 14 | P. 5637-5642 | URL

2020 - G. Gavrilov, G. Sotnikova, A. Sotnikov, E. Smirnova
Interrelation of electrocaloric and concomitant effects in lead magnesium niobate based ceramics
Journal of Materials Science | Volume: 55 | P. 6783–6793 | URL

2020 - M. Schütz, S. Ilyas, K. Lê, B.M. Valldor, S. Mathur
Nanoparticle Arrays Having Directed Hybrid Topology via Covalent Self-Assembly of Iron Oxide and Silica Nanoparticles
ACS Applied Nano Materials | Volume: 3 | Issue: 6 | P. 5936–5943 | URL

2020 - M. Nichterwitz, S. Neitsch, S. Röher, D. Wolf, K. Nielsch, K. Leistner
Voltage-controlled ON switching and manipulation of magnetization via the redox transformation of β-FeOOH nanoplatelets
Journal of Physics D: Applied Physics | Volume: 53 | Issue: 8 | P. 084001/1-9 | URL

2020 - T.E. Kuzmicheva, S.A. Kuzmichev, I.V. Morozov, S. Wurmehl, B. Büchner
Experimental Evidence of Three-Gap Superconductivity in LiFeAs
JETP Letters | Volume: 111 | Issue: 6 | P. 350-356 | URL

2020 - C. Fornari, H. Bentmann, S. Morelhão, T. Peixoto, P. Rappl, A. Tcakaev, V. Zabolotnyy, M. Kamp, T. Lee, C. Min, P. Kagerer, R. Vidal, A. Isaeva, M. Ruck, V. Hinkov, F. Reinert, E. Abramof
Incorporation of Europium in Bi2Te3 Topological Insulator Epitaxial Films
The Journal of Physical Chemistry C | Volume: 124 | Issue: 29 | P. 16048-16057 | URL

2020 - S. Baek, H. Yeo, S. Do, K. Choi, L. Janssen, M. Vojta, B. Büchner
Observation of a random singlet state in a diluted Kitaev honeycomb material
Physical Review B | Volume: 102 | Issue: 9 | P. 094407/1-6 | URL

2020 - E. Dmitrieva, X. Yu, H. Hartmann
Electron-transfer initiated nucleophilic substitution of thiophenolate anion by 1-chloro-substituted 4-(thiazol-2-ylazo)naphthalenes
Electrochemistry Communications | Volume: 114 | P. 106706/1-5 | URL

2020 - M. Novozhilova, D. Anischenko, I. Chepurnaya, E. Dmitrieva, V. Malev, A. Timonov, M. Karushev
Metal-centered redox activity in a polymeric Cobalt(II) complex of a sterically hindered salen type ligand
Electrochimica Acta | Volume: 353 | P. 136496/ | URL

2020 - M. Yao, K. Manna, Q. Yang, A. Fedorov, V. Voroshnin, V.B. Schwarze, J. Hornung, S. Chattopadhyay, Z. Sun, S. Guin, J. Wosnitza, H. Borrmann, C. Shekhar, N. Kumar, J. Fink, Y. Sun, C. Felser
Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa
Nature Communications | Volume: 11 | Issue: 1 | P. 2033/1-7 | URL

2020 - M. Konyk, S. Baran, L. Romaka, A. Szytula, V. Romaka
Crystal structure and magnetic properties of TmV0.17Ge2 and LuV0.15Ge2 ternary germanides
Journal of Physics and Chemistry of Solids | Volume: 137 | P. 109205/1-6 | URL

2020 - U. Stockert, S. Seiro, N. Caroca-Canales, E. Hassinger, C. Geibel
Valence effect on the thermopower of Eu systems
Physical Review B | Volume: 101 | Issue: 23 | P. 235106/1-7 | URL

2020 - S.-H. Baek, J. Ok, J. Kim, S. Aswartham, I. Morozov, D. Chareev, T. Urata, K. Tanigaki, Y. Tanabe, B. Büchner, D.V. Efremov
Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
npj Quantum Materials | Volume: 5 | Issue: 1 | P. 8/1-5 | URL

2020 - M.A.A. Mohamed, E. Ibrahim, N. Perez Rodriguez, S. Hampel, B. Büchner, G. Schierning, K. Nielsch, R. He
Tuning of the electronic and phononic properties of NbFeSb half-Heusler compound by Sn/Hf co-doping
Acta Materialia | Volume: 196 | P. 669-676 | URL

2020 - A. Validov, A. Kamashev, N. Garif’yanov, J. Schumann, V. Kataev, J. Thomas, B. Büchner, I. Garifullin
FMR Studies of Exchange-Biased Heusler Alloy Thin Films
Applied Magnetic Resonance | Volume: 51 | Issue: 5 | P. 461-472 | URL

2020 - A. Isaeva, R. Schönemann, T. Doert
Syntheses, Crystal Structure and Magnetic Properties of Tl₉RETe₆ (RE = Ce, Sm, Gd)
Crystals | Volume: 10 | Issue: 4 | P. 277/1-11 | URL

2020 - X. Hong, F. Caglieris, R. Kappenberger, S. Wurmehl, S. Aswartham, F. Scaravaggi, P. Lepucki, A.U.B. Wolter-Giraud, H.-J. Grafe, B. Büchner, C. Hemker-Heß
Evolution of the Nematic Susceptibility in LaFe_1−xCo_xAsO
Physical Review Letters | Volume: 125 | Issue: 6 | P. 067001/1-7 | URL

2020 - A. Kostanyan, R. Westerström, D. Kunhardt, B. Büchner, A. Popov, T. Greber
Sub-Kelvin hysteresis of the dilanthanide single-molecule magnet Tb2ScN@C80
Physical Review B | Volume: 101 | Issue: 13 | P. 134429/1-6 | URL

2020 - S. Selter, G. Bastien, A.U.B. Wolter-Giraud, S. Aswartham, B. Büchner
Magnetic anisotropy and low-field magnetic phase diagram of the quasi-two-dimensional ferromagnet Cr₂Ge₂Te₆
Physical Review B | Volume: 101 | Issue: 1 | P. 014440/1-10 | URL

2020 - D. Mikhailova, S. Maletti, A. Missyul, B. Büchner
Comparison of Layered Li(Li0.2Rh0.8)O2 and LiRhO2 upon Li Removal: Stabilizing Effect of Li Substitution
Inorganic Chemistry | Volume: 59 | Issue: 13 | P. 9108-9115 | URL

2020 - K. Bokai, A. Tarasov, V. Shevelev, O. Vilkov, A. Makarova, D. Marchenko, A. Petukhov, M. Muntwiler, A. Fedorov, V. Voroshnin, L. Yashina, C. Laubschat, D. Vyalikh, D. Usachov
Hybrid h-BN–Graphene Monolayer with B–C Boundaries on a Lattice-Matched Surface
Chemistry of Materials | Volume: 32 | Issue: 3 | P. 1172-1181 | URL

2020 - Y. Pan, M. Yao, X. Hong, Y. Zhu, F. Fan, K. Imasato, Y. He, C. Heß, J. Fink, J. Yang, B. Büchner, C. Fu, G. Snyder, C. Felser
Mg3(Bi,Sb)2 single crystals towards high thermoelectric performance
Energy & Environmental Science | Volume: 13 | P. 1717-1724 | URL

2020 - E. Dmitrieva, A. Popov, X. Yu, H. Hartmann
On the Electrochemical Reduction of 4‐(Thiazol‐2‐ylazo)‐Substituted 1‐Chloronaphthalenes: Formation and Characterization of Stable Radical Anions
ChemElectroChem | Volume: 7 | Issue: 7 | P. 1666-1671 | URL

2020 - V. Grinenko, R. Sarkar, K. Kihou, C. Lee, I. Morozov, S. Aswartham, B. Büchner, P. Chekhonin, W. Skrotzki, K. Nenkov, R. Hühne, K. Nielsch, S. Drechsler, V. Vadimov, M. Silaev, P. Volkov, I. Eremin, H. Luetkens, H. Klauss
Superconductivity with broken time-reversal symmetry inside a superconducting s-wave state
Nature Physics | Volume: 16 | P. 789-794 | URL

2020 - S. Haindl, M. Sato, S. Wurmehl, B. Büchner, E. Kampert
Pulsed laser deposition of Fe-oxypnictides: Co- and F-substitution
Superconductor Science and Technology | Volume: 33 | Issue: 10 | P. 105004/1-9 | URL

2020 - M. Feig, W. Schnelle, A. Maisuradze, A. Amon, C. Baines, M. Nicklas, S. Seiro, L. Howald, R. Khasanov, A. Leithe-Jasper, R. Gumeniuk
Conventional isotropic s-wave superconductivity with strong electron-phonon coupling in Sc5Rh6Sn18
Physical Review B | Volume: 102 | Issue: 2 | P. 024508/1-8 | URL

2020 - Y. Liu, V. Khavrus, T. Lehmann, H. Yang, L. Stepien, M. Greifzu, S. Oswald, T. Gemming, V. Bezugly, G. Cuniberti
Boron-Doped Single-Walled Carbon Nanotubes with Enhanced Thermoelectric Power Factor for Flexible Thermoelectric Devices
ACS Applied Energy Materials | Volume: 3 | Issue: 3 | P. 2556-2564 | URL

2020 - R. Giraud, J. Dufouleur
Quantum Transport in Nanostructures of 3D Topological Insulators
Physica Status Solidi (B) - Basic Solid State Physics | P. 2000066/1-12 | URL

Habilitations

PhD Theses (since 2013)(older)

Master Theses (since 2013) (older)

Diploma Theses

Bachelor Theses