75As NMR-NQR study in superconducting LiFeAs

  • S. -H. BaekEmail author
  • H. -J. Grafe
  • F. Hammerath
  • M. Fuchs
  • C. Rudisch
  • L. Harnagea
  • S. Aswartham
  • S. Wurmehl
  • J. van den Brink
  • B. Büchner
Regular Article


We report results of 75As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) experiments as well as 7Li NMR on different samples of self flux grown LiFeAs and 5% Co doped LiFeAs single crystals, and a polycrystalline LiFeAs sample. We were able to distinguish the samples by their slightly different quadrupole frequencies, ν Q , which is a direct measure of the electric field gradient (EFG) at the As site. Interestingly, samples with a large quadrupole frequency appear to show a different Knight shift and spin lattice relaxation in the superconducting state from those with a lower ν Q , yet all the samples are clearly superconducting. For sample S1 which has the largest ν Q , we find constant Knight shift \(\mathcal{K}\) across T c for a certain direction of the magnetic field and a peculiar upturn of the NQR spin lattice relaxation rate (T 1 T)−1 below T c . In contrast, samples with a lower ν Q exhibit the expected behavior for a singlet superconductor: a drop of \(\mathcal{K}\) and (T 1 T)−1 for both NMR and NQR below T c . Our results show that already tiny changes in stoichiometry uncovered by slightly different NQR frequencies lead to very different behavior of the NMR parameters in the superconducting state of LiFeAs. Different possibilities will be discussed which may explain the contrasting behavior.


Solid State and Materials 


  1. 1.
    Y. Kamihara, T. Watanabe, M. Hirano, H. Hosono, J. Am. Chem. Soc. 130, 3296 (2008) CrossRefGoogle Scholar
  2. 2.
    M. Rotter, M. Tegel, D. Johrendt, Phys. Rev. Lett. 101, 107006 (2008) ADSCrossRefGoogle Scholar
  3. 3.
    M.J. Pitcher, T. Lancaster, J.D. Wright, I. Franke, A.J. Steele, P.J. Baker, F.L. Pratt, W.T. Thomas, D.R. Parker, S.J. Blundell, S.J. Clarke, J. Am. Chem. Soc. 132, 10467 (2010) CrossRefGoogle Scholar
  4. 4.
    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, V. Hinkov, Phys. Rev. Lett. 104, 187001 (2010) ADSCrossRefGoogle Scholar
  5. 5.
    S.V. Borisenko, V.B. Zabolotnyy, D.V. Evtushinsky, T.K. Kim, I.V. Morozov, A.N. Yaresko, A.A. Kordyuk, G. Behr, A. Vasiliev, R. Follath, B. Büchner, Phys. Rev. Lett. 105, 067002 (2010) ADSCrossRefGoogle Scholar
  6. 6.
    A.A. Kordyuk, V.B. Zabolotnyy, D.V. Evtushinsky, T.K. Kim, I.V. Morozov, M.L. Kulić, R. Follath, G. Behr, B. Büchner, S.V. Borisenko, Phys. Rev. B 83, 134513 (2011) ADSCrossRefGoogle Scholar
  7. 7.
    Y.J. Um, J.T. Park, B.H. Min, Y.J. Song, Y.S. Kwon, B. Keimer, M. Le Tacon. Phys. Rev. B 85, 012501 (2012) ADSGoogle Scholar
  8. 8.
    S.J. Zhang, X.C. Wang, R. Sammynaiken, J.S. Tse, L.X. Yang, Z. Li, Q.Q. Liu, S. Desgreniers, Y. Yao, H.Z. Liu, C.Q. Jin, Phys. Rev. B 80, 014506 (2009) ADSCrossRefGoogle Scholar
  9. 9.
    F.L. Pratt, P.J. Baker, S.J. Blundell, T. Lancaster, H.J. Lewtas, P. Adamson, M.J. Pitcher, D.R. Parker, S.J. Clarke, Phys. Rev. B 79, 052508 (2009) ADSCrossRefGoogle Scholar
  10. 10.
    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) ADSCrossRefGoogle Scholar
  11. 11.
    C. Platt, R. Thomale, W. Hanke, Phys. Rev. B 84, 235121 (2011) ADSCrossRefGoogle Scholar
  12. 12.
    M.A. Tanatar, J.-Ph. Reid, S. René de Cotret, N. Doiron-Leyraud, F. Laliberté, E. Hassinger, J. Chang, H. Kim, K. Cho, Yoo Jang Song, Yong Seung Kwon, R. Prozorov, L. Taillefer, Phys. Rev. B 84, 054507 (2011) ADSCrossRefGoogle Scholar
  13. 13.
    K. Hashimoto, S. Kasahara, R. Katsumata, Y. Mizukami, M. Yamashita, H. Ikeda, T. Terashima, A. Carrington, Y. Matsuda, T. Shibauchi, Phys. Rev. Lett. 108, 047003 (2012) ADSCrossRefGoogle Scholar
  14. 14.
    A.E. Taylor, M.J. Pitcher, R.A. Ewings, T.G. Perring, S.J. Clarke, A.T. Boothroyd, Phys. Rev. B 83, 220514 (2011) ADSCrossRefGoogle Scholar
  15. 15.
    P.M.R. Brydon, M. Daghofer, C. Timm, J. van den Brink, Phys. Rev. B 83, 060501 (2011) ADSCrossRefGoogle Scholar
  16. 16.
    A.K. Pramanik, L. Harnagea, C. Nacke, A.U.B. Wolter, S. Wurmehl, V. Kataev, B. Büchner, Phys. Rev. B 83, 094502 (2011) ADSCrossRefGoogle Scholar
  17. 17.
    K. Cho, H. Kim, M.A. Tanatar, Y.J. Song, Y.S. Kwon, W.A. Coniglio, C.C. Agosta, A. Gurevich, R. Prozorov, Phys. Rev. B 83, 060502 (2011) ADSCrossRefGoogle Scholar
  18. 18.
    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) ADSCrossRefGoogle Scholar
  19. 19.
    P. Jeglič, A. Potočnik, M. Klanjšek, M. Bobnar, M. Jagodič, K. Koch, H. Rosner, S. Margadonna, B. LV, A.M. Guloy, D. Arčon, Phys. Rev. B 81, 140511 (2010) ADSCrossRefGoogle Scholar
  20. 20.
    Zheng Li, Yosuke Ooe, Xian-Cheng Wang, Qing-Qing Liu, Chang-Qing Jin, M. Ichioka, Guo qing Zheng, J. Phys. Soc. Jpn 79, 083702 (2010) ADSCrossRefGoogle Scholar
  21. 21.
    L. Ma, J. Zhang, G.F. Chen, Weiqiang Yu, Phys. Rev. B 82, 180501 (2010) ADSCrossRefGoogle Scholar
  22. 22.
    G. Lang, H.-J. Grafe, D. Paar, F. Hammerath, K. Manthey, G. Behr, J. Werner, B. Büchner, Phys. Rev. Lett. 104, 097001 (2010) ADSCrossRefGoogle Scholar
  23. 23.
    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 Des. 10, 4428 (2010) CrossRefGoogle Scholar
  24. 24.
    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) ADSCrossRefGoogle Scholar
  25. 25.
    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, 064512 (2011) ADSCrossRefGoogle Scholar
  26. 26.
    J.H. Tapp, Zhongjia Tang, Bing LV, K. Sasmal, B. Lorenz, P.C.W. Chu, A.M. Guloy, Phys. Rev. B 78, 060505 (2008) ADSCrossRefGoogle Scholar
  27. 27.
    X.C. Wang, Q.Q. Liu, Y.X. Lv, W.B. Gao, L.X. Yang, R.C. Yu, F.Y. Li, C.Q. Jin, Solid State Commun. 148, 538 (2008) ADSCrossRefGoogle Scholar
  28. 28.
    Yoo Jang Song, Jin Soo Ghim, Byeong Hun Min, Yong Seung Kwon, Myung Hwa Jung, Jong-Soo Rhyee, Appl. Phys. Lett. 96, 212508 (2010) ADSCrossRefGoogle Scholar
  29. 29.
    K. Kitagawa, N. Katayama, K. Ohgushi, M. Yoshida, M. Takigawa, J. Phys. Soc. Jpn 77, 114709 (2008) ADSCrossRefGoogle Scholar
  30. 30.
    N.J. Curro, A.P. Dioguardi, N. ApRoberts-Warren, A.C. Shockley, P. Klavins, New J. Phys. 11, 075004 (2009) ADSCrossRefGoogle Scholar
  31. 31.
    S.-H. Baek, N.J. Curro, T. Klimczuk, E.D. Bauer, F. Ronning, J.D. Thompson, Phys. Rev. B 79, 052504 (2009) ADSCrossRefGoogle Scholar
  32. 32.
    S.-H. Baek, H.-J. Grafe, L. Harnagea, S. Singh, S. Wurmehl, B. Büchner, Phys. Rev. B 84, 094510 (2011) ADSCrossRefGoogle Scholar
  33. 33.
    G.C. Carter, L.H. Bennett, D.J. Kahan, Metallic shift in NMR (Pergamon, New York, 1977)Google Scholar
  34. 34.
    K. Kitagawa, Y. Mezaki, K. Matsubayashi, Y. Uwatoko, M. Takigawa, J. Phys. Soc. Jpn 80, 033705 (2011) ADSCrossRefGoogle Scholar
  35. 35.
    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. Buchner, New J. Phys. 11, 035002 (2009) ADSCrossRefGoogle Scholar
  36. 36.
    T. Imai, A.W. Hunt, K.R. Thurber, F.C. Chou, Phys. Rev. Lett. 81, 3006 (1998) ADSCrossRefGoogle Scholar
  37. 37.
    A. Abragam, The Principles of Nuclear Magnetism (Oxford University Press, 1961)Google Scholar
  38. 38.
    Y. Nakai, K. Ishida, Y. Kamihara, M. Hirano, H. Hosono, Phys. Rev. Lett. 101, 077006 (2008) ADSCrossRefGoogle Scholar
  39. 39.
    K. Yosida, Phys. Rev. 110, 769 (1958) MathSciNetADSCrossRefGoogle Scholar
  40. 40.
    A.M. Clogston, A.C. Gossard, V. Jaccarino, Y. Yafet, Rev. Mod. Phys. 36, 170 (1964)ADSCrossRefGoogle Scholar
  41. 41.
    W.A. Hines, W.D. Knight, Phys. Rev. B 4, 893 (1971)ADSCrossRefGoogle Scholar
  42. 42.
    D. Vollhardt, P. Wölfe, The Superfluid Phase of Helium 3 (Taylor and Francis, New York, 1990)Google Scholar
  43. 43.
    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, 054534 (2011) ADSCrossRefGoogle Scholar

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • S. -H. Baek
    • 1
    Email author
  • H. -J. Grafe
    • 1
  • F. Hammerath
    • 1
  • M. Fuchs
    • 1
  • C. Rudisch
    • 1
  • L. Harnagea
    • 1
  • S. Aswartham
    • 1
  • S. Wurmehl
    • 1
  • J. van den Brink
    • 1
  • B. Büchner
    • 1
  1. 1.Leibniz Institute for Solid State and Materials Research IFW-DresdenDresdenGermany

Personalised recommendations