de Haas–van Alphen Study of the Fermi Surfaces of Superconducting LiFeP and LiFeAs

C. Putzke, A. I. Coldea, I. Guillamón, D. Vignolles, A. McCollam, D. LeBoeuf, M. D. Watson, I. I. Mazin, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, and A. Carrington
Phys. Rev. Lett. 108, 047002 – Published 26 January 2012

Abstract

We report a de Haas–van Alphen oscillation study of the 111 iron pnictide superconductors LiFeAs with Tc18K and LiFeP with Tc5K. We find that for both compounds the Fermi surface topology is in good agreement with density functional band-structure calculations and has almost nested electron and hole bands. The effective masses generally show significant enhancement, up to 3 for LiFeP and 5 for LiFeAs. However, one hole Fermi surface in LiFeP shows a very small enhancement, as compared with its other sheets. This difference probably results from k-dependent coupling to spin fluctuations and may be the origin of the different nodal and nodeless superconducting gap structures in LiFeP and LiFeAs, respectively.

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  • Received 25 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.047002

© 2012 American Physical Society

Authors & Affiliations

C. Putzke1, A. I. Coldea2,*, I. Guillamón1, D. Vignolles3, A. McCollam4, D. LeBoeuf3, M. D. Watson2, I. I. Mazin5, S. Kasahara6, T. Terashima6, T. Shibauchi7, Y. Matsuda7, and A. Carrington1,†

  • 1H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
  • 2Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
  • 3Laboratoire National des Champs Magnétiques Intenses (CNRS), Toulouse, France
  • 4High Field Magnet Laboratory, IMM, Radboud University Nijmegen, 6525 ED Nijmegen, The Netherlands
  • 5Code 6393, Naval Research Laboratory, Washington, D.C. 20375, USA
  • 6Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
  • 7Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan

  • *Corresponding author. amalia.coldea@physics.ox.ac.uk
  • Corresponding author. a.carrington@bristol.ac.uk

See Also

Nodal versus Nodeless Behaviors of the Order Parameters of LiFeP and LiFeAs Superconductors from Magnetic Penetration-Depth Measurements

K. Hashimoto, S. Kasahara, R. Katsumata, Y. Mizukami, M. Yamashita, H. Ikeda, T. Terashima, A. Carrington, Y. Matsuda, and T. Shibauchi
Phys. Rev. Lett. 108, 047003 (2012)

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Vol. 108, Iss. 4 — 27 January 2012

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