Dr. Sabine Wurmehl

Department:IFF - Magnetic Oxides and Intermetallics
Position:Head of department "Synthesis and Crystal Growth"
Address:IFW Dresden
Helmholtzstraße 20
01069 Dresden
Telephone number:+49-351-4659-519
E-mail:s.wurmehl(at)ifw-dresden.de



 

Research interests (also see research webpage at IFF)

  •   Functional intermetallics
  •   Unconventional superconductors
  •   Frustrated magnets                                                                                                                                               

Curriculum Vitae

Academic career

2013:              Offer of a junior professorship (W1), Universität zu Köln, Germany (declined)
2010-present:  Emmy Noether research group leader at IFW Dresden
2009-2010:      Post-doctoral fellow at IFW Dresden, Germany
2007-2009:      Post-doctoral DFG fellow with Prof. B. Koopmans, TU Eindhoven, Netherlands
2002-2006:      PhD in the group of Prof. C. Felser, University of Mainz, Germany

Education

University of Mainz, Germany – Chemistry (Ph.D., summa cum laude 2006)
University of Mainz, Germany – Chemistry (Diploma, 2002)  

Awards

DFG postdoctoral research fellow (Eindhoven, Netherlands)
DFG Emmy Noether research grant (IFW Dresden, Germany)
IFF Research Prize 2012
IFW Research Prize 2014  

 

List of publications  

see all publications at Researcher ID  

2015

133) Non-Fermi-liquid scattering rates and anomalous band dispersion in ferropnictides
J. Fink, A. Charnukha, E. D. L. Rienks, Z. H. Liu, S. Thirupathaiah, I. Avigo, F. Roth, H. S. Jeevan, P. Gegenwart, M. Roslova, I. Morozov, S. Wurmehl, U. Bovensiepen, S. Borisenko, M. Vojta, and B. Buchner
Phys. Rev. B 92, 201106(R) (2015)

132) Interface control by homoepitaxial growth in pulsed laser deposited iron chalcogenide thin films
S. Molatta, S. Haindl, S. Trommler, M. Schulze, S. Wurmehl, und R. Hühne
Scien. Rep. 5, 16334 (2015)

131) Direct observation of spin-orbit coupling in iron-based superconductors
S. V. Borisenko, D. V. Evtushinsky, Z.-H. Liu, I. Morozov, R. Kappenberger, S. Wurmehl, B. Büchner, A. N. Yaresko, T. K. Kim, M. Hoesch, T. Wolf, & N. D. Zhigadlo
Nature physics, in print (2015).

130) Coexistence of superconductivity and magnetism in Ca1−xNaxFe2As2: Universal suppression of the magnetic order parameter in 122 iron pnictides
P. Materne, S. Kamusella, R. Sarkar, T. Goltz, J. Spehling, H. Maeter, L. Harnagea, S. Wurmehl, B. Büchner, H. Luetkens, C. Timm, and H.-H. Klauss
Phys. Rev. B 92, 134511 (2015).

129) Structural Inhomogeneities in FeTe0.6Se0.4: Relation to Superconductivity
K. Prokes, M. Schulze, S. Hartwig, N. Schäfer, S. Landsgesell, C.G.F. Blum, D. Abou-Ras, M. Y. Hacisalihoglu, E. Ressouche, B. Ouladdiaf, B. Büchner and S. Wurmehl
J. Cryst. Growth 432, 95 (2015)

128) Enhancement of low-frequency fluctuations and superconductivity breakdown in Mn-doped La1−yYyFeAsO0.89F0.11 superconductors
F. Hammerath, M. Moroni, L. Bossoni, S. Sanna, R. Kappenberger, S. Wurmehl, A. U. B. Wolter, M. A. Afrassa, Y. Kobayashi, M. Sato, B. Büchner, and P. Carretta Phys. Rev. B
92, 020505(R) (2015).

127) NMR investigation of boron impurities in refined metallurgical grade Silicon
H. Grafe, W. Löser S. Schmitz, M. Sakaliyska, S. Wurmehl, S. Eisert, B. Reichenbach, J. Acker, A. Rietig, J. Ducke, and T. Müller
Phys. Stat. Solidi A 212, 2031 (2015)

126) Mutual Independence of Critical Temperature and Superfluid Density under Pressure in Optimally Electron-Doped Superconducting LaFeAsO1−xFx
G. Prando, Th. Hartmann, W. Schottenhamel, Z. Guguchia, S. Sanna, F. Ahn, I. Nekrasov, C. G. F. Blum, A. U. B. Wolter, S. Wurmehl, R. Khasanov, I. Eremin,and B. Büchner
Phys. Rev. Lett. 114, 247004 (2015)

125) Crystal growth and electronic phase diagram of 4d−doped Na1−δFe1−xRhxAs in comparison to 3d−doped Na1−δFe1−xCoxAs
F. Steckel, M. Roslova, R. Beck, I. Morozov, S. Aswartham, D. Evtushinsky, C. G. F. Blum, M. Abdel-Hafiez, D. Bombor, J. Maletz, S. Borisenko, A. V. Shevelkov, A. U. B. Wolter, C. Hess, S. Wurmehl, and B. Buchner
Phys. Rev. B 91, 184516 (2015)

124) Ground state and low-energy magnetic dynamics in the frustrated magnet CoAl2O4 as revealed by local spin probes
M. Iakovleva, E. Vavilova, H.-J. Grafe, S. Zimmermann, A. Alfonsov, H. Luetkens, H.-H. Klauss, A. Maljuk, S. Wurmehl, B. Büchner, and V. Kataev
Phys. Rev. B 91, 144419 (2015)

123) Impact of local order and stoichiometry on the ultrafast magnetization dynamics of Heusler compounds
D. Steil, O. Schmitt, R. Fetzer, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, S. Rodan, C.G.F. Blum, B. Balke, S. Wurmehl, M. Aeschlimann and M. Cinchetti
J. Phys. D: Appl. Phys. 48, 164016 (2015)  

122) Spin reorientation in Ba0.65Na0.35Fe2As2 studied by single-crystal neutron diffraction
F. Waßer, A. Schneidewind, Y. Sidis, S. Wurmehl, S. Aswartham, B. Büchner, and M. Braden
Phys. Rev. B 91, 060505(R) (2015)  

121) Flux growth and characterization of Sr2NiWO6 single crystals
C.G.F. Blum, A. Holcombe, M. Gellesch, M.I. Sturza, S. Rodan, R. Morrow, A. Maljuk, P. Woodward, P. Morris, A.U.B. Wolter, B. Büchner, S. Wurmehl
J. Cryst. Growth 421, 39 (2015)  

120) Local magnetism and structural properties of Heusler Ni2MnGa alloys
M. Belesi, L. Giebeler, C. G. F. Blum, U. K. Rößler, B. Büchner, and S. Wurmehl
Phys. Rev. B 91, 134415 (2015)  

119) Characterization of doped Na(Fe1−xTx)As single crystals with T = Pd, Ni, Cr, and Mn
F. Steckel, R. Beck, M. Roslova,  M. Abdel-Hafiez, A. U. B. Wolter, I. Morozov, S. Wurmehl, C. Hess,  B. Büchner
J. Supercond. Nov. Magn. 28, 1123 (2015)  

118) Nuclear magnetic resonance study of thin Co2FeAl0.5Si0.5 Heusler films with varying thickness
A. Alfonsov, B. Peters, F. Y. Yang, B. Büchner, and S. Wurmehl
Phys. Rev. B 91, 064421 (2015)  

117) Granular behavior observed in the polycrystalline superconducting LiFeAs
S. J. Singh, R. Beck, S. Wurmehl, C. Hess, B. Büchner
Supercond. Sci. Technol. 28, 025006 (2015)

2014

116) NMR spectroscopy applied to Heusler thin films-a review (invited)
S. Wurmehl, J.T. Kohlhepp
Spin 4, 1440019 (2014)  

115) Magnetic order and spin dynamics in La2O2Fe2OSe2 probed by 57Fe Mössbauer, 139La NMR, and muon-spin relaxation spectroscopy
M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss,
Phys. Rev. B 90, 184408 (2014)

114) Fine structure of the incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering
N. Qureshi, P. Steffens, D. Lamago, Y. Sidis, O. Sobolev, R. A. Ewings, L. Harnagea, S. Wurmehl, B. Büchner, and M. Braden
Phys. Rev. B 90, 144503 (2014)  

113) Identical spin fluctuations in Cu- and Co-doped BaFe2As2 independent of electron doping
H.-J. Grafe, U. Gräfe, A. P. Dioguardi, N. J. Curro, S. Aswartham, S. Wurmehl, and B. Büchner
Phys. Rev. B 90, 0945519 (2014)  

112) Spin density wave order and fluctuations in Mn3Si : A transport studyF. Steckel, S. Rodan, R. Hermann, C. G. F. Blum, S. Wurmehl, Bernd Büchner, and C. Hess
Phys. Rev. B 90, 134411 (2014)  

111) Phonon anomalies, orbital-ordering and electronic raman scattering in iron-pnictide Ca(Fe0.97Co0.03)2As2: temperature-dependent Raman study
P. Kumar, D.V.S. Muthu, L. Harnagea, S. Wurmehl, B. Büchner and A. K. Sood
J. Phys. Condend. Matter 26, 305403 (2104)  

110) Superconducting properties of K1−xNaxFe2As2 under pressure
V. Grinenko, W. Schottenhamel, A. U. B. Wolter, D. V. Efremov, S.-L. Drechsler, S. Aswartham, M. Kumar, S. Wurmehl, M. Roslova, I. V. Morozov, B. Holzapfel, B. Büchner, E. Ahrens, S. I. Troyanov, S. Köhler, E. Gati, S. Knöner, N. H. Hoang, M. Lang, F. Ricci, and G. Profeta
Phys. Rev. B 90, 094511 (2014)

109) Electronic properties of Co2FeSi investigated by X-ray magnetic linear dichroism
M. Emmel, A. Alfonsov, D. Legut, A. Kehlberger, E. Vilanova, I.P. Krug, D.M. Gottlob, M. Belesi, B. Büchner, M. Kläui, P.M. Oppeneer, S. Wurmehl, H.J. Elmers, G. Jakob
J. Magn. Magn. Mater 368, 364 (2014)  

108) Josephson effect and Andreev reflection in Ba1–xNaxFe2As2 (x = 0.25 and 0.35) point contacts
V.V. Fisun, O.P. Balkashin, O.E. Kvitnitskaya, I.A. Korovkin, N.V. Gamayunova, S. Aswartham, S. Wurmehl, and Yu.G. Naidyuk
Low Temperature Physics 40, (2014)  

107) Single 20 meV boson mode in KFe2As2 detected by point-contact spectroscopy Yu.G. Naidyuk, O.E. Kvitnitskaya, N.V. Gamayunova, L. Boeri, S. Aswartham, S. Wurmehl, D.V. Efremov, G. Fuchs, S.-L. Drechsler
Phys. Rev. B  90, 094505 (2014)

106) Low-temperature properties of single-crystal CrB2
A. Bauer, A. Regnat, C. G. F. Blum, S. Gottlieb-Schönmeyer, B. Pedersen, M. Meven, S. Wurmehl, J. Kunes,  and C. Pfleiderer
Phys. Rev. B 90, 064414 (2014)  

105) Specific heat of Ca0.32Na0.68Fe2As2 single crystals: Unconventional s(+/-) multiband superconductivity with intermediate repulsive interband coupling and sizable attractive intraband couplings
S. Johnston, M. Abdel-Hafiez, L. Harnagea, V. Grinenko, D. Bombor, Y. Krupskaya, C. Hess, S. Wurmehl, A. U. B. Wolter, B. Büchner, H. Rosner, and S.-L. Drechsler
Phys. Rev. B 89, 134507 (2014)  

104) Growth of single crystalline delafossite LaCuO2 by the travelling-solvent floating zone method
A. Mohan, B. Büchner, S. Wurmehl, C. Hess
J. Cryst. Growth 402, 304 (2014)  

103) Signatures of superconducting and pseudogap phases in ultrafast transient reflectivity of Ca(Fe0.927Co0.073)2As2
S. Kumar, L. Harnagea, S. Wurmehl, B. Büchner and A. K. Sood
EPL 105, 47004 (2014)  

102) Specific heat of K0.71Na0.29Fe2As2 at very low temperatures
A. Reifenberger, M. Hempel, P. Vogt, S. Aswartham,  M. Abdel-Hafiez, V. Grinenko, S. Wurmehl, S.-L. Drechsler, A. Fleischmann, C. Enss, R. Klingeler
J. Low. Temp. Phys. 175, 155 (2014).  

101) Exploring point-contact spectra of Ba1-xNaxFe2As2 in the normal and superconducting states
Yu. G. Naidyuk, O. E. Kvitnitskaya, S. Aswartham, G. Fuchs, K. Nenkov, and S. Wurmehl
Phys. Rev. B 89, 104512 (2014).  

100) Strong electron pairing at the iron 3dxz, yz orbitals in hole-doped BaFe2As2 superconductors revealed by angle-resolved photoemission spectroscopy
D. V. Evtushinsky, V. B. Zabolotnyy, T. K. Kim, A. A. Kordyuk, A. N. Yaresko, J. Maletz, S. Aswartham, S. Wurmehl, A. V. Boris, D. L. Sun, C. T. Lin, B. Shen, H. H. Wen, A. Varykhalov, R. Follath, B. Büchner, and S. V. Borisenko
Phys. Rev. B 89, 064514  (2014).  

99) Spin susceptibility in superconducting LiFeAs studied by polarized neutron diffraction
J. Brand, A. Stunault, S. Wurmehl, L. Harnagea, B. Büchner, M. Meven, and M. Braden
Phys. Rev. B 89, 045141 (2014).  

98) Superconducting specific-heat jump ΔCel ∝  (β≈2) for K1−xNaxFe2As2
V. Grinenko, D. V. Efremov, S.-L. Drechsler, S. Aswartham, D. Gruner, M. Roslova, I. Morozov, K. Nenkov, S. Wurmehl, A. U. B. Wolter, B. Holzapfel, and B. Büchner
Phys. Rev. B 89, 060504(R) (2014).  

97) Effect of annealing on spinodally decomposed Co2CrAl grown via floating zone technique
A. Omar, C.G.F. Blum, W. Löser, B. Büchner, S. Wurmehl
J. Cryst. Growth 386, xx (2014).  

96) Growth, characterization, and magnetic properties of a Li(Mn,Ni)PO4 single crystal
K. Wang, A. Maljuk, C.G.F. Blum, T. Kolb, C. Jähne, C. Neef, H.-J. Grafe, L. Giebeler, H. Wadepohl, H.-P. Meyer, S. Wurmehl, R. Klingeler
J. Cryst. Growth 386, 16 (2014).  

2013

95) Independent Ordering of Two Interpenetrating Magnetic Sublattices in the Double Perovskite Sr2CoOsO6
R. Morrow , R. Mishra , O. D. Restrepo , M. R. Ball , W. Windl, S. Wurmehl, U. Stockert , B. Büchner , and P. M. Woodward
J. Am. Chem. Soc. 135, 18824 (2013).  

94) de Haas-van Alphen effect and Fermi surface properties of single-crystal CrB2 M. Brasse, L. Chioncel, J. Kuneš, A. Bauer, A. Regnat, C. G. F. Blum, S. Wurmehl, C. Pfleiderer, M. A. Wilde, and D. Grundler
Phys. Rev. B 88, 155138 (2013).  

93) Diversity of Microstructural Phenomena in Superconducting and Non-superconducting RbxFe2–ySe2: A Transmission Electron Microscopy Study at the Atomic Scale
M. V. Roslova, O. I. Lebedev, I. V. Morozov, S. Aswartham, S. Wurmehl, B. Büchner, and A. V. Shevelkov
Inorg. Chem 52, 14419 (2013).  

92) Evidence for a vortex-glass transition in superconducting Ba(Fe0.9Co0.1)2As2
G. Prando, R. Giraud, S. Aswartham, O. Vakaliuk, M. Abdel-Hafiez, C. Hess, S. Wurmehl, A. U. B. Wolter, and B. Büchner
J. Phys.: Condens. Matter 25, 505701 (2013).  

91) Flux dynamics and avalanches in the 122 pnictide superconductor Ba0.65Na0.35Fe2As2
A. K Pramanik, S. Aswartham, A. U. B. Wolter, S. Wurmehl, V. Kataev and B. Büchner
J. Phys.: Condens. Matter 25, 495701 (2013).  

90) Epitaxial films of Heusler compound Co2FeAl0.5Si0.5 with high crystalline quality grown by off-axis sputtering
B. Peters, A. Alfonsov, C. G. F. Blum, S. J. Hageman, P. M. Woodward, S. Wurmehl, B. Büchner, and F. Y. Yang
Appl. Phys. Lett. 103, 162404 (2013)  

89) 55Mn NMR study of quaternary half-metallic ferromagnetic Co2Mn1−xFexSi Heusler compounds
S. Wurmehl, A. Alfonsov, J. T. Kohlhepp, H. J. M. Swagten, B. Koopmans, M. Wojcik, B. Balke, V. Ksenofontov, C. G. F. Blum, and B. Büchner
Phys. Rev. B 88, 134424 (2013)  

88) Peculiarities of anisotropic electrical resistivity in Lu2PdSi3 single crystals
C. Cao, C. G. F. Blum, T. Ritschel, S. Rodan, L. Giebeler, D. Bombor, S. Wurmehl and W. Löser
Cryst. Eng. Comm. 15, 9052 (2013)  

87) Progressive slowing down of spin fluctuations in underdoped LaFeAsO1−xFx
F
. Hammerath, U. Gräfe, T. Kühne, H. Kühne, P. L. Kuhns, A. P. Reyes, G. Lang, S. Wurmehl, B. Büchner, P. Carretta, and H.-J. Grafe
Phys. Rev. B 88, 104503 (2013)  

86) Local structure and hyperfine interactions of 57Fe in NaFeAs studied by Mössbauer spectroscopy
I. Presniakov, I. Morozov, A. Sobolev, M. Roslova, A. Boltalin, V. Son, O. Volkova, A. Vasiliev, S. Wurmehl and B. Büchner
J. Phys.: Condens. Matter 25, 346003 (2013)  

85) On the half-metallicity of Co2FeSi Heusler alloy: Point-contact Andreev reflection spectroscopy and ab initio study
L. Makinistian, M. M. Faiz, R. P. Panguluri, B. Balke, S. Wurmehl, C. Felser, E. A. Albanesi, A. G. Petukhov, and B. Nadgorny
Phys. Rev. B 87, 220402(R) (2013)  

84) Phase dynamics and growth of Co2Cr1−xFexAl Heusler compounds: A key to understand their anomalous physical properties
A. Omar, M. Dimitrakopoulou, C. G. F. Blum, H. Wendrock, S. Rodan, S. Hampel, W. Löser, B. Büchner, and S. Wurmehl
Cryst. Growth & Design, 13, 3925 (2013)  

83) Facile Nanotube-Assisted Synthesis of Ternary Intermetallic Nanocrystals of the Ferromagnetic Heusler Phase Co2FeGa
M. Gellesch, M. Dimitrakopoulou, M. Scholz, C. G.F. Blum, M. Schulze, J. van den Brink, S. Hampel, S. Wurmehl, and B. Büchner
Cryst. Growth & Design, 13, 2707 (2013)  

82) NMR study of the impact of annealing on structural evolution of epitaxial Co2MnSi Heusler films
S. Rodan, A. Alfonsov, M. E. Belesi, F. Ferraro, J. T. Kohlhepp, H. J. M. Swagten, B. Koopmans, Y. Sakuraba, S. Bosu, K. Takanashi, B. Büchner, S. Wurmehl,
Appl. Phys. Lett. 102, 242404 (2013)  

81) Evidence of d-wave superconductivity in K1-xNaxFe2As2 (x=0,0.1) single crystals from low-temperature specific-heat measurements
M. Abdel-Hafiez, V. Grinenko, S. Aswartham, I. Morozov, M. Roslova, O. Vakaliuk, S. Johnston, D. V. Efremov, J. van den Brink, H. Rosner, M. Kumar, C. Hess, S. Wurmehl, A. U. B. Wolter, B. Büchner, E. L. Green, J. Wosnitza, P. Vogt, A. Reifenberger, C. Enss, M. Hempel, R. Klingeler, and S.-L. Drechsler
Phys. Rev. B 87, 180507(R) (2013)  

80) Role of in-plane and out-of-plane dilution in CeFeAsO: Charge doping versus disorder
G. Prando, O. Vakaliuk, S. Sanna, G. Lamura, T. Shiroka, P. Bonfà, P. Carretta, R. De Renzi, H.-H. Klauss, C. G. F. Blum, S. Wurmehl, C. Hess, and B. Büchner
Phys. Rev. B 87, 174519 (2013)  

79) Observation of charge accumulation and onsite Coulomb repulsion at transition metal impurities in the iron pnictides
R. Kraus, V. Bisogni, L. Harnagea, S. Aswartham, S. Wurmehl, G. Levy, I. S. Elfimov, B. Büchner, G. A. Sawatzky, and J. Geck
Phys. Rev. B 87, 134516 (2013)  

78) Gap-Dependent Quasiparticle Dynamics and Coherent Acoustic Phonons in CaFe2As2 across Spin Density Wave Phase Transition
S. Kumar, L. Harnagea, S. Wurmehl, B. Büchner, and A. K. Sood
J. Phys. Soc. Jpn. 82, 044715 (2013)  

77) Anomalous superconducting state in LiFeAs implied by the As-75 Knight shift measurement
S.-H. Baek, L. Harnagea, S. Wurmehl, B. Büchner and H.-J. Grafe
J. Phys.: Condens. Matter 25, 162204 (2013)  

76) Microwave absorption study of pinning regimes in Ba(Fe1-xCox)2As2 single crystals
Y. Talanov, N. Beisengulov, G. Kornilov, T. Shaposhnikova, E. Vavilova, C. Nacke, S. Wurmehl, N. Panarina, C. Hess, V. Kataev and B. Büchner
Supercond. Sci. Technol. 26, 045015 (2013)  

75) Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se, Te) thin films
K. Iida, J. Hänisch, E. Reich, F. Kurth, R. Hühne, L. Schultz, B. Holzapfel, M.Hanawa, I. Tsukada, M. Schulze, S. Aswartham, S. Wurmehl and B. Büchner Phys. Rev. B 87, 104510 (2013)  

74) Electronic band structure and momentum dependence of the superconducting gap in Ca1-xNaxFe2As2 from angle-resolved photoemission spectroscopy
D. V. Evtushinsky, V. B. Zabolotnyy, L. Harnagea, A. N. Yaresko, S. Thirupathaiah, A. A. Kordyuk, J. Maletz, S. Aswartham, S. Wurmehl, E. Rienks, R. Follath, B. Büchner, and S. V. Borisenko
Phys. Rev. B 87, 094501 (2013)  

73) Disordered magnetism in superconducting KFe2As2 single crystals
V. Grinenko, S.-L. Drechsler, M. Abdel-Hafiez, S. Aswartham, A. U. B. Wolter, S. Wurmehl, C. Hess, K. Nenkov, G. Fuchs, D. V. Efremov, B. Holzapfel, J. van den Brink, B. Büchner
Physica status solidi (b) 250, 593 (2013)  

72) Half-Metallic ferromagnetism with unexpectedly small spin splitting in the Heusler compound Co2FeSi
D. Bombor, C. G. F. Blum, O. Volkonskiy, S. Rodan, S. Wurmehl, C. Hess, and B. Büchner
Phys. Rev. Lett. 110, 066601 (2013)  

71) Single crystal growth of antiferromagnetic Mn3Si by a two-phase RF floating-zone method
R. Hermann, H. Wendrock, S. Rodan, U.K. Rößler, C.G.F. Blum, S. Wurmehl, B. Büchner
J. Cryst. Growth 363, 1 (2013)  

70) Interband Quasiparticle Scattering in Superconducting LiFeAs Reconciles Photoemission and Tunneling Measurements
C. Hess, S. Sykora, T. Hänke, R. Schlegel, D. Baumann, V. B. Zabolotnyy, L. Harnagea, S. Wurmehl, J. van den Brink, and B. Büchner
Phys. Rev. Lett. 110, 017006 (2013)  

2012

69) Investigation of LiFeAs by means of "break-junction" technique
S. A. Kuzmichev, T. E. Shanygina, I. V. Morozov, A. I. Boltalin, M. V. Roslova, S. Wurmehl, B. Büchner
JETP Letters 95, 537 (2012)  

68) Acoustic and optical phonon dynamics from femtosecond time-resolved optical spectroscopy of the superconducting iron pnictide Ca(Fe0.944Co0.056)2As2
S. Kumar, L. Harnagea, S. Wurmehl, B. Büchner and A. K. Sood,
EPL 100, 57007 (2012)  

67) Weak-coupling superconductivity in electron-doped NaFe0.95Co0.05As revealed by ARPES
S. Thirupathaiah, D. V. Evtushinsky, J. Maletz, V. B. Zabolotnyy, A. A. Kordyuk, T. K. Kim, S. Wurmehl, M. Roslova, I. Morozov, B. Büchner, and S. V. Borisenko Phys. Rev. B 86, 214508 (2012)  

66) Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
J. Knolle, V. B. Zabolotnyy, I. Eremin, S. V. Borisenko, N. Qureshi, M. Braden, D. V. Evtushinsky, T. K. Kim, A. A. Kordyuk, S. Sykora, Ch. Hess, I. V. Morozov, S. Wurmehl, R. Moessner, and B. Büchner
Phys. Rev. B 86, 174519 (2012)  

65) Pr magnetism and its interplay with the Fe spin-density wave in PrFeAsO1-xFx (x=0,0.15)
U. Stockert, N. Leps, L. Wang, G. Behr, S. Wurmehl, B. Büchner, and R. Klingeler Phys. Rev. B 86, 144407 (2012)  

64) Probing the Role of Co Substitution in the Electronic Structure of Iron Pnictides
G. Levy, R. Sutarto, D. Chevrier, T. Regier, R. Blyth, J. Geck, S. Wurmehl, L. Harnagea, H. Wadati, T. Mizokawa, I. S. Elfimov, A. Damascelli, and G. A. Sawatzky
Phys. Rev. Lett. 109, 077001 (2012)  

63) Local magnetic anisotropy in BaFe2As2: A polarized inelastic neutron scattering study
N. Qureshi, P. Steffens, S. Wurmehl, S. Aswartham, B. Büchner, and M. Braden Phys. Rev. B 86, 060410(R) (2012)  

62) Probing the unconventional superconducting state of LiFeAs by quasiparticle interference
T. Hänke, S. Sykora, R. Schlegel, D. Baumann, L. Harnagea, S. Wurmehl, M. Daghofer, B. Büchner, J. van den Brink, C. Hess
Phys. Rev. Lett. 108, 127001 (2012)  

61) Specific heat and upper critical fields in KFe2As2 single crystals
M. Abdel-Hafiez, S. Aswartham, S. Wurmehl, V. Grinenko, C. Hess, S.-L. Drechsler, S. Johnston, A.U.B. Wolter, B. Büchner, H. Rosner, L. Boeri
Phys. Rev. B  85, 134533 (2012)  

60) Gd3+ electron spin resonance spectroscopy on LaO1-xF xFeAs superconductors A. Alfonsov, F. Muranyi, N. Leps, R. Klingeler, A. Kondrat, C. Hess, S. Wurmehl, A. Koefiler, G. Behr, V. Kataev, B. Büchner
J. Ex. Theo. Phys. 114, 662 (2012)  

59) 75As NMR-NQR study in superconducting LiFeAs
S.-H. Baek, H.-J. Grafe, F. Hammerath, M. Fuchs, C. Rudisch, L. Harnagea, S. Aswartham, S. Wurmehl, J. van den Brink, B. Büchner
Europ. Phys. J. B 85, 159 (2012)  

58) ac susceptibility investigation of vortex dynamics in nearly optimally doped RFeAsO1-xFx superconductors (R = La, Ce, Sm)
G. Prando, P. Carretta, R. De Renzi, S. Sanna, H.-J. Grafe, S. Wurmehl, B. Büchner
Phys. Rev. B 85, 14452 (2012)  

57) Inelastic neutron-scattering measurements of incommensurate magnetic excitations on superconducting LiFeAs single crystals
N. Qureshi, P. Steffens, Y. Drees, A.C. Komarek, D. Lamago, Y. Sidis, L. Harnagea, H.-J. Grafe, S. Wurmehl, B. Büchner, M. Braden
Phys. Rev. Lett. 108, 117001 (2012)  

56) Hole doping in BaFe2As2: The case of Ba1-xNaxFe2As2 single crystals
S. Aswartham, M. Abdel-Hafiez, D. Bombor, M. Kumar, A.U.B. Wolter, C. Hess, D.V. Evtushinsky, V.B. Zabolotnyy, A.A. Kordyuk, T.K. Kim, S.V. Borisenko, G. Behr, B. Büchner, S. Wurmehl
Phys. Rev. B 85, 22452 (2012)  

55) Collapsed tetragonal phase in Ca(Fe1-xCox)2As2 stabilized by pressure: Structural studies using single-crystal neutron diffraction
K. Prokeš, B. Ouladdiaf, L. Harnagea, S. Wurmehl, D. N. Argyriou, and B. Büchner Phys. Rev. B 85, 104523 (2012)  

54) 59Co nuclear magnetic resonance study of the local distribution of atoms in the Heusler compound Co2FeAl0.5Si0.5
S. Wurmehl, J. T. Kohlhepp, H. J. M. Swagten, and B. Koopmans
J. Appl. Phys. 111, 043903 (2012)  

2011

53) Effect of Co substitution on the magnetic order in Ca(Fe1-xCox)2As2 single crystals studied by neutron diffraction
K. Prokeš, S. Mat’aš, L. Harnagea, S. Singh, S. Wurmehl, D. N. Argyriou, and B. Büchner
Phys. Rev. B 83, 104414 (2011)  

52) Local formation of a Heusler structure in CoFeAl alloys
S. Wurmehl, P.J. Jacobs, J.T. Kohlhepp, H.J.M. Swagten, B. Koopmans, S. Maat, M.J. Carey, and J.R. Childress
Appl. Phys. Lett. 98, 12506 (2011)  

51) Single crystal growth and physical properties of superconducting ferro-pnictides Ba(Fe,Co)2As2 grown using self-flux and Bridgman techniques
S. Aswartham, C. Nacke, G. Friemel, N. Leps, S. Wurmehl, N. Wizent, C. Hess, R. Klingeler, G. Behr, S. Singh, B. Büchner
J. Cryst. Growth 314, 341 (2011)  

50) High-field electron spin resonance spectroscopy study of GdFeAsO1-xFx superconductors
A. Alfonsov, F. Muranyi, V. Kataev, G. Lang, N. Leps, L. Wang, R. Klingeler, A. Kondrat, C. Hess, S. Wurmehl, A. Koehler, G. Behr, S. Hampel, M. Deutschmann, S. Katrych, N.D. Zhigadlo, Z. Bukowski, J. Karpinski, B. Büchner
Phys. Rev. B 83, 94526 (2011)  

49) Phase diagram of the iron arsenide superconductors Ca(Fe1-xCox)2As2
L. Harnagea, S. Singh, G. Friemel, N. Leps, D. Bombor, M. Abdel-Hafiez, A.U.B. Wolter, C. Hess, R. Klingeler, G. Behr, S. Wurmehl, B. Büchner
Phys. Rev. B 83, 94523 (2011)  

48) Raman evidence for the superconducting gap and spin-phonon coupling in the superconductor Ca(Fe0.95Co0.05)2As2
P. Kumar, A. Bera, D.V.S. Muthu, A. Kumar, U.V. Waghmare, L. Harnagea, C. Hess, S. Wurmehl, S. Singh, B. Büchner, A.K. Sood
J. Phys. Condens. Matter 23, 255403 (2011)  

47) Specific heat and angle-resolved photoemission spectroscopy study of the superconducting gaps in LiFeAs
U. Stockert, M. Abdel-Hafiez, D.V. Evtushinsky, V.B. Zabolotnyy, A.U.B. Wolter, S. Wurmehl, I. Morozov, R. Klingeler, S.V. Borisenko, B. Büchner
Phys. Rev. B 83, 224512 (2011)  

46) Resistivity and Hall effect of LiFeAs: Evidence for electron-electron scattering
O. Heyer, T. Lorenz, V.B. Zabolotnyy, D.V. Evtushinsky, S.V. Borisenko, I. Morozov, L. Harnagea, S. Wurmehl, C. Hess, B. Büchner
Phys. Rev. B 84, 64512 (2011)  

45) Multigap superconductivity in single crystals of Ba0.65Na0.35Fe2As2: A calorimetric investigation
A.K. Pramanik, M. Abdel-Hafiez, S. Aswartham, A.U.B. Wolter, S. Wurmehl, V. Kataev, B. Büchner
Phys. Rev. B 84, 64525 (2011)  

44) Suppressed superconductivity in charge-doped Li(Fe1-xCox)As single crystals
S. Aswartham, G. Behr, L. Harnagea, D. Bombor, A. Bachmann, I.V. Morozov, V.B. Zabolotnyy, A.A. Kordyuk, T.K. Kim, D.V. Evtushinsky, S.V. Borisenko, A.U.B. Wolter, C. Hess, S. Wurmehl, B. Büchner
Phys. Rev. B 84, 54534 (2011)  

43) Fishtail effect and vortex dynamics in LiFeAs single crystals
A.K. Pramanik, L. Harnagea, C. Nacke, A.U.B. Wolter, S. Wurmehl, V. Kataev, B. Büchner
Phys. Rev. B 83, 94502  (2011)  

42) As vacancies, local moments, and Pauli limiting in LaFeAs1-dO0.9F0.1 superconductors
V. Grinenko, K. Kikoin, S.-L. Drechsler, G. Fuchs, K. Nenkov, S. Wurmehl, F. Hammerath, G. Lang, H.-J. Grafe, B. Holzapfel, J. Brink, B. Buechner, L. Schultz
Phys. Rev. B 84, 134516 (2011)  

41) Pseudogap-like phase in Ca(Fe1-xCox)2As2 revealed by 75As NQR
S.-H. Baek, H.-J. Grafe, L. Harnagea, S. Singh, S. Wurmehl, B. Büchner
Phys. Rev. B 84, 94510 (2011)  

40) Transport and thermal properties of single- and polycrystalline NiZr(0.5)Hf(0.5)Sn
S. Ouardi, G.H. Fecher, C. Felser, C.G.F. Blum, D. Bombor, C. Hess, S. Wurmehl, B. Büchner, E. Ikenaga
Appl. Phys. Lett. 99, 152112 (2011)  

39) Exploring the details of the martensite-austenite phase transition of the shape memory Heusler compound Mn2NiGa by hard x-ray photoelectron spectroscopy, magnetic and transport measurements
C.G.F. Blum, S. Ouardi, G.H. Fecher, B. Balke, X. Kozina, G. Stryganyuk, S. Ueda, K. Kobayashi, C. Felser, S. Wurmehl, B. Büchner
Appl. Phys. Lett. 98, 252501 (2011)  

38) Generic Fe buffer layers for Fe-based superconductors: Epitaxial FeSe1-xTex thin films
K. Iida, J. Haenisch, M. Schulze, S. Aswartham, S. Wurmehl, B. Büchner, L. Schultz, B. Holzapfel
Appl. Phys. Lett. 99, 202503 (2011)  

2010

37) Weak Superconducting Pairing and a Single Isotropic Energy Gap in Stoichiometric LiFeAs
D. S. Inosov, J. S. White, D.V. Evtushinsky, I.V. Morozov, A. Cameron, U. Stockert, V. B. Zabolotnyy, T. K. Kim, A. A. Kordyuk, S.V. Borisenko,  E. M. Forgan, R. Klingeler, J. T. Park, S. Wurmehl, A. N. Vasiliev, G. Behr, C. D. Dewhurst, and V. Hinkov
Phys. Rev. Lett. 104, 187001 (2010).  

36) Pinning effects in ceramic SmO1-xFxFeAs as revealed by microwave absorption N.Y. Panarina, Y.I. Talanov, T.S. Shaposhnikova, N.R. Beysengulov, E. Vavilova, G. Behr, A. Kondrat, C. Hess, N. Leps, S. Wurmehl, R. Klingeler, V. Kataev, B. Büchner
Phys. Rev. B 81, 224509 (2010)  

35) Critical current and vortex dynamics in single crystals of Ca(Fe1-xCox)2As2
A.K. Pramanik, L. Harnagea, S. Singh, S. Aswartham, G. Behr, S. Wurmehl, C. Hess, R. Klingeler, B. Büchner
Phys. Rev. B 82, 14503 (2010)  

34) Crystal and magnetic structure of the oxypnictide superconductor LaFeAsO1-xFx: A neutron-diffraction study
N. Qureshi, Y. Drees, J. Werner, S. Wurmehl, C. Hess, R. Klingeler, B. Büchner, M. T. Fernández-Díaz, and M. Braden
Phys. Rev. B 82, 184521 (2010)  

33) Single crystal growth and characterization of superconducting LiFeAs
I. Morozov, A. Boltalin, O. Volkova, A. Vasiliev, O. Kataeva, U. Stockert, M. Abdel-Hafiez, D. Bombor, A. Bachmann, L. Harnagea, M. Fuchs, H.-J. Grafe, G. Behr, R. Klingeler, S. Borisenko, C. Hess, S. Wurmehl, B. Büchner
Cryst. Growth and Design 10, 4429 (2010)  

32) Hyperfine magnetic field on iron atoms and Co-Fe disordering in Co2FeSi
V. Ksenofontov, M. Wójcik, S. Wurmehl, H. Schneider, B. Balke, G. Jakob, and C. Felser
J. Appl. Phys. 107, 09B106 (2010).  

31) Local antiferromagnetic correlations in the iron pnictide superconductors LaFeAsO1−xFx and Ca(Fe1−xCox)2As2 as seen via normal-state susceptibility
R. Klingeler, N. Leps, I. Hellmann, A. Popa, U. Stockert, C. Hess, V. Kataev, H.-J. Grafe, F. Hammerath, G. Lang, S. Wurmehl, G. Behr, L. Harnagea, S. Singh, and B. Büchner
Phys. Rev. B 81, 024506 (2010).  

2009

30) Highly ordered, half-metallic Co2FeSi single crystals
C. G. F. Blum, C. A. Jenkins, J. Barth, C. Felser, S. Wurmehl, G. Friemel, C. Hess, G. Behr, B. Büchner, A. Reller, S. Riegg, J. T. Kohlhepp, H. J. H. Swagten
Appl. Phys. Lett. 95, 161903 (2009).  

29) Off-stoichiometry in Co2FeSi thin films sputtered from stoichiometric targets revealed by nuclear magnetic resonance
S. Wurmehl, J. T. Kohlhepp, H. J. M. Swagten, B. Koopmans, C. G. F. Blum, V. Ksenofontov, H. Schneider, G. Jakob, D. Ebke, G. Reiss
J. Phys. D: Appl. Phys. 42, 084017 (2009).

2008

28) Topical review: Nuclear magnetic resonance studies of materials for spintronic applications
S. Wurmehl, J. T. Kohlhepp
J. Phys. D: Appl. Phys. 41, 173002 (2008)  

27) Rational design of new materials for spintronics: Co2FeZ (Z = Al, Ga, Si, Ge)
B. Balke, S. Wurmehl, G. H. Fecher, C. Felser, J. Kübler
Sci. Technol. Adv. Mater. 9, 014102 (2008)  

26) Hyperfine field distribution in the Heusler compound Co2FeAl probed by 59Co NMR
S. Wurmehl, J. T. Kohlhepp, H. J. M. Swagten, B. Koopmans
J. Phys. D: Appl. Phys. 41, 115007 (2008)  

25) Effects of random distribution in Co2Mn1−xFexSi compounds probed by 55Mn NMR
S. Wurmehl, J. T. Kohlhepp, H. J. M. Swagten, B. Koopmans, M. Wójcik , B. Balke, C. G. F. Blum, V. Ksenofontov, G. H. Fecher, C. Felser
J. Appl. Phys. 103, 07D706 (2008)  

2007

24) Probing the random distribution of half-metallic Co2Mn1−xFexSi Heusler alloys
S. Wurmehl, J. T. Kohlhepp, H. J. M. Swagten, B. Koopmans, M. Wójcik , B. Balke, C. G. F. Blum, V. Ksenofontov, G. H. Fecher, C. Felser
Appl. Phys. Lett. 91, 052506 (2007)  

23) Structural, magnetic and transport properties of Co2FeSi Heusler films
H. Schneider, C. Herbort, G. Jakob, H. Adrian, S. Wurmehl, C. Felser
J. Phys. D: Appl. Phys. 40, 2613 (2007)  

22) Bulk sensitive photoemission spectroscopy of Heusler compounds
G. H. Fecher, S. Wurmehl,  B. Balke, K. Kobayashi, Y. Takeda, Y. Saitoh, H. A. Dürr,  F. Kronast, C. Felser
J. Electron Spectroscopy and Related Phenomena 156-158 XXXVI (2007)  

21) Structural characterization of the Co2FeZ (Z=Al, Si, Ga, and Ge) Heusler compounds by x-ray diffraction and extended x-ray absorption fine structure spectroscopy
B. Balke, S. Wurmehl, G. H. Fecher, C. Felser, M. C. M. Alves, F. Bernardi, J. Morais
Appl. Phys. Lett. 90, 172501 (2007)  

20) Structural properties of the quaternary Heusler alloy Co2Cr1-xFexAl.
S. Wurmehl, M. C. M. Alves, J. Morais, V. Ksenofontov, S. R. Teixeira, G. Machado, G. H. Fecher, C. Felser
J. Phys. D: Appl. Phys. 40, 1524 (2007)  

19) Structural, magnetic and transport properties of Co2FeSi Heusler films
H. Schneider, Ch. Herbort, G. Jakob, M. Jourdan, H. Adrian, S. Wurmehl, C. Felser
J. Phys. D: Appl. Phys. 40, 1548  (2007)   2006

18) Epitaxial film growth and magnetic moments of Co2FeSi
H. Schneider, G. Jakob, M. Kallmayer, H.-J. Elmers, M. Cinchetti, S. Wurmehl, C. Felser, M. Aeschlimann, H. Adrian
Phys. Rev. B 74, 174426 (2006)  

17) Structure and properties of the CoMnSb in the context of  half-metallic ferromagnetism
V. Ksenofontov, G. Melnyk, M. Wojcik, S. Wurmehl, K. Kroth, S. Reiman, P. Blaha, C. Felser
Phys. Rev. B 74, 134426 (2006)  

16) Powder Magnetoresistance of Co2Cr0.6Fe0.4Al /Al2O3 Powder Compacts
T. Block, S. Wurmehl, J. Windeln, C. Felser
Appl. Phys. Lett. 88, 202504 (2006)  

15) Structural Properties of the Quaternary Heusler Compound Co2Cr1-xFexAl
S. Wurmehl, J. Morais, M. C. M. Alves, S. R. Teixeira, G. H. Fecher, C. Felser
J. Alloys and Comp. 423, 159 (2006)  

14) Co2CrIn: A Further Magnetic Heusler Compound
S. Wurmehl, G. H. Fecher, C. Felser
Z. Naturforsch. B 61, 749 (2006)  

13) Valence electron rules for prediction of half-metallic compensated-ferrimagnetic behaviour of Heusler compounds with complete spin polarisation.
S. Wurmehl, H. C. Kandpal, G. H. Fecher, C. Felser
J. Phys.: Condens. Matter. 18, 6171 (2006)  

12) Slater-Pauling Rule and Curie-Temperature of Co2 Based Heusler Compounds
G. H. Fecher, H. C. Kandpal, S. Wurmehl, G. Schönhense, C. Felser
J. Appl. Phys. 99, 08J106 (2006)  

11) Half-metallic Ferromagnetism with High Magnetic Moment and High Curie Temperature in Co2FeSi
S. Wurmehl, G. H. Fecher, V. Ksenofontov, F. Casper, U. Stumm, H.-J. Lin, Y. Hwu, C. Felser
J. Appl. Phys. 99, 08J103 (2006)  

10) Electronic Structure and Spectroscopy of the Quaternary Heusler Alloy Co2Cr1-xFexAl
S. Wurmehl, G. H. Fecher, K. Kroth, F. Kronast, H. A. Dürr, Y. Takeda, Y. Saitoh, K. Kobayashi, H.-J. Lin, G. Schönhense
J. Phys. D: Appl. Phys. 39, 803 (2006)  

9) Magnetic Properties of Co2Mn1-xFexSi Heusler Alloys
M. Kallmayer, H. J. Elmers, B. Balke, S. Wurmehl, F. Emmerling, G. H. Fecher, C. Felser
J. Phys. D: Appl. Phys. 39, 786 (2006)  

8) Investigation of Co2FeSi: The Heusler Compound with Highest Curie Temperature and Magnetic Moment
S. Wurmehl, G. H. Fecher, H. C. Kandpal, V. Ksenofontov, H.-J. Lin, C. Felser Appl. Phys. Lett. 88, 032503 (2006)  

2005

7) Design of Magnetic Materials. Part I: The Electronic Structure of the Ordered, Doped Heusler Compound Co2Cr1-xFexAl
G. H. Fecher, H. C. Kandpal, S. Wurmehl, C. Felser, G. Schönhense
J. Phys.: Condens. Matter. 17, 7237 (2005)  

6) Geometric, Electronic, and Magnetic Structure of Co2FeSi: Curie Temperature and Magnetic Moment Measurements and Calculations
S. Wurmehl, G. H. Fecher, H. C. Kandpal, V. Ksenofontov, H. J. Lin, J. Morais, C. Felser
Phys. Rev. B 72, 184434 (2005)  

2004

5) Field Dependence of Orbital Magnetic Moments in the Heusler Compounds Co2FeAl and Co2Cr0.6Fe0.4Al
H. J. Elmers, S. Wurmehl, G. H. Fecher, G. Jakob, C. Felser, G. Schönhense
Appl. Phys. A 79, 557 (2004)  

4) Enhanced Orbital Magnetic Moments in the Heusler Compounds Co2CrAl, Co2Cr0.6Fe0.4Al and Co2FeAl
H. J. Elmers, S. Wurmehl, G. H. Fecher, G. Jakob, C. Felser, G. Schönhense
J. Magn. Magn. Mater. 272-276, 758 (2004)  

2003

2) Investigation of a Novel Material for Magnetoelectronics: Co2Cr0.6Fe0.4Al
C. Felser, B. Heitkamp, F. Kronast, D. Schmitz, S. Cramm, H. A. Dürr, H. J. Elmers, G. H. Fecher, S. Wurmehl, T. Block, D. Valdaitsev, S. A. Nepijko, A. Gloskovskii, G. Jakob, G. Schönhense, W. Eberhardt
J. Phys.: Condens. Matter. 15, 7019 (2003)  

1) Element Specific Magnetic Moments from Core-absorption Magnetic Circular Dichroism of the Doped Heusler Alloy Co2Cr0.6Fe0.4Al
H. J. Elmers, G. Fecher, D. Valdaitsev, S. Nepijko, A. Gloskowskij, G. Jakob, G. Schönhense, S. Wurmehl, T. Block, C. Felser, P.-C. Hsu, W.-L. Tsai, S. Cramm
Phys. Rev. B 67, 104412 (2003)  

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