Dr. Franziska Hammerath

Department:IFF - Magnetic Oxides and Intermetallics
Position:Postdoc
Address:IFW Dresden
Helmholtzstraße 20
01069 Dresden
Telephone number:+49-351-4659-401
E-mail:F.Hammerath(at)ifw-dresden.de



Research Interests

  • Correlated Magnetism
  • Functional Nanohybrid Materials on the basis of Carbon Nanotubes
  • Functional Intermetallics, such as Heusler Compounds
  • Fe-based Superconductors and Related Systems

Projects

Methods

  • Nuclear Magnetic Resonance
  • Muon Spin Rotation

Journal papers

Recently submitted

22. C. Hess, H. Grafe, A. Kondrat, G. Lang, F. Hammerath, L. Wang, R. Klingeler, G. Behr and B. Büchner,              Nematicity in LaFeAsO1-xFx, preprint on: arXiv:1604.03860 (2016).

21. K. Karmakar, M. Skoulatos, G. Prando, B. Roessli, U. Stuhr, F. Hammerath, C. Rüegg, and S. Singh, Effects of quantum impurity spins on the magnetic properties of zigzag and linear spin chains, preprint on arXiv:1602.03677 (2016).

20. G. Lang, L. Veyrat, U. Graefe, F. Hammerath, D. Paar, G. Behr, S. Wurmehl, and H.-J. Grafe, Spatial
      competition of the ground states in 1111 iron pnictides
, preprint on arXiv:1508.06532 (2015).

2015

19. Y. Utz, F. Hammerath, S. Nishimoto, C. Hess, N. Sekhar Beesetty, R. Saint-Martin, A. Revcolevschi, B.
      Buechner, H.-J. Grafe: Suppression of the impurity-induced local magnetism by the opening of a spin
      pseudogap in Ni-doped Sr2CuO3
, Physical Review B 92, 060405(R) (2015).

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

17. G. A. Artioli, F. Hammerath, M. C. Mozzati, P. Carretta, F. Corana, B. Mannucci, S. Margadonna, and
      L. Malavasi, Superconductivity in Sm-doped [n]phenacenes (n=3,4,5),
      Chem. Comm. 51, 1092-1095 (2015).

2014

16. F. Hammerath, E.M. Bruening, S. Sanna, Y. Utz, N.S. Beesetty, R. Saint-Martin, A. Revcolevschi, C.
      Hess, B. Buechner, H.-J. Grafe: Spin gap in the single spin-12 chain cuprate Sr1.9Ca0.1CuO3,
      Physical Review B 89, 184410 (2014).

15. F. Hammerath, P. Bonfá, S. Sanna, G. Prando, R. De Renzi, Y. Kobayashi, M. Sato, and P. Carretta,
      Poisoning effect of Mn in LaFe1-xMnxAsO0.89F0.11: Unveiling a quantum critical point in the phase
      diagram of iron-based superconductors
, Physical Review B, 89, 134503 (2014).

14. S.-H. Baek, L.M. Reinold, M. Graczyk-Zajacb, R. Riedel, F. Hammerath, B. Buechner, H.-J. Grafe:
      Lithium dynamics in carbon-rich polymer-derived SiCN ceramics probed by nuclear magnetic
      resonance
, Journal of Power Sources 253, 342 (2014).

2013

13. F. Hammerath, U. Graefe, T. Kuehne, H. Kuehne, P.L. Kuhns, A.P. Reyes, G. Lang, S. Wurmehl, B.
      Buechner, P. Carretta, H.-J. Grafe: Progressive slowing down of spin fluctuations in underdoped
      LaFeAsO1-xFx
, Physical Review B 88, 104503 (2013).

2012

12. S.-H. Baek, H.-J. Grafe, F. Hammerath, M. Fuchs, C. Rudisch, L. Harnagea, S. Aswartham, S.
      Wurmehl, J. van den Brink, B. Buechner: 75As NMR-NQR study in superconducting LiFeAs,
      The European Physical Journal B 85, 159 (2012).

2011

11. V. Grinenko, K. Kikoin, S.-L. Drechsler, G. Fuchs, K. Nenkov, S. Wurmehl, F. Hammerath, G. Lang,
      H.-J. Grafe, B. Holzapfel, J. van den Brink, B. Buechner, L. Schultz: As vacancies, local moments, and
      Pauli limiting in LaFeAs1-δO0.9F0.1 superconductors
, Physical Review B 84, 134516 (2011).

10. F. Hammerath, S. Nishimoto, H.-J. Grafe, A.U.B. Wolter, V. Kataev, P. Ribeiro, C. Hess, S.-L.
      Drechsler, B. Buechner: Spin gap in the zigzag spin-1/2 chain cuprate Sr0.9Ca0.1CuO2,
      Physical Review Letters 107, 017203 (2011).

2010

9. F. Hammerath, S.-L. Drechsler, H.-J. Grafe, G. Lang, G. Fuchs, G. Behr, I. Eremin, M.M. Korshunov, B.
    Buechner: Unusual disorder effects in superconducting LaFeAs1-δO0.9F0.1 as revealed by 75As NMR
    spectroscopy
, Physical Review B 81, 140504(R) (2010).

8. G. Lang, H.-J. Grafe, D. Paar, F. Hammerath, K. Manthey, G. Behr, J. Werner, B. Buechner: Nanoscale
    electronic order in iron pnictides
, Physical Review Letters 104, 097001 (2010).

7. 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, B. Buechner: Local antiferromagnetic
    correlations in the iron pnictide superconductors LaFeAsO1-xFx and Ca(Fe1-xCox)2As2 as seen via
    normal-state susceptibility
, Physical Review B 81, 024506 (2010).

6. G. Lang, H.-J. Grafe, F. Hammerath, K. Manthey, D. Paar, G. Behr, J. Werner, J. Hamann-Borrero, B.    
    Buechner: Probing of the charge distribution in iron pnictides, Physica C 470, S454-S455 (2010).

5. G. Fuchs, S.-L. Drechsler, N. Kozlova, M. Bartkowiak, G. Behr, K. Nenkov, H.-H. Klauss, J.
    Freudenberger, M. Knupfer, F. Hammerath, G. Lang, H.-J. Grafe, B. Buechner, L. Schultz: Evidence for
    Pauli-limiting behaviour at high fields and enhanced upper critical fields near Tc in several
    disordered FeAs based superconductors
, Physica C 470, S288-S290 (2010).

4. D. Paar, H.-J. Grafe, G. Lang, F. Hammerath, K. Manthey, G. Behr, J. Werner, B. Buechner: NMR study
    of the electronic properties of superconducting LaO0.9F0.1FeAs
, Physica C 470, S468-S469 (2010).

2009

3. H.-J. Grafe, G. Lang, F. Hammerath, D. Paar, K. Manthey, K. Koch, H. Rosner, N.J. Curro, G. Behr, J.
    Werner, N. Leps, R. Klingeler, H.-H. Klauss, F. J. Litterst, B. Buechner: Electronic properties of
    LaO1-xFxFeAs in the normal state probed by NMR/NQR
, New Journal of Physics 11, 035002 (2009).

2008

2. H.-J. Grafe, F. Hammerath, A. Vyalikh, G. Urbanik, V. Kataev, T. Wolf, G. Khaliullin, B. Buechner:
    Contrasting spin dynamics in Zn- and Ni-doped NdBa2Cu3O6+y single crystals from Cu nuclear
    quadrupole resonance: Evidence for correlations between antiferromagnetism and pseudogap
    effects
, Physical Review B 77, 014522 (2008).

2007

1. H.-J. Grafe, F. Hammerath, T. Wolf, B. Buechner: Cu nuclear quadrupole resonance study of    
    NdBa2(Cu,Zn,Ni)3O7-δ
, Physica C 460-462, 896-897 (2007).

 

Ph.D. Thesis

Magnetism and Superconductivity in Iron-based Superconductors as Probed by Nuclear Magnetic Resonance, Springer, Wiesbaden (2012).  (complete reprint of the Ph.D. thesis)

 

 

Invited Talks

2014

The poisoning effect of Mn in LaFe1-xMnxFeO0.89F0.11 - unveiling a quantum critical point in the phase diagram of iron-based superconductors, Workshop "NMR, muSR, Mössbauer spectroscopies in the study of Fe-based and other unconventional high-Tc superconductors", IFW Dresden, Dresden, Germany, 18.07.2014 (2014).

2013

Impurity Effects in S=1/2 Heisenberg Spin Chains as Probed by 63Cu Nuclear Magnetic Resonance, LOTHERM workshop "Advances in Quantum Magnets - Dynamics", Kolymbari, Crete, September 2013 (2013).

The poisoning effect of Mn in LaFe1-xMnxFeO0.89F0.11 - a combined μSR and NMR study, IFF Department Seminar, IFW Dresden, Dresden, Germany, 30.09.2013 (2013).

2011

Unusual NMR line broadening and spin gap in the zigzag S=1/2 spin chain compound Sr1-xCaxCuO2, University of Zagreb, Department of Physics, Faculty of Science, Zagreb/ Croatia, 15.11.11 (2011).