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, A. Carrington

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58 Citations (Scopus)

Abstract

We report a de Haas-van Alphen oscillation study of the 111 iron pnictide superconductors LiFeAs with T c18K and LiFeP with T c5K. 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.

Original languageEnglish
Article number047002
JournalPhysical Review Letters
Volume108
Issue number4
DOIs
Publication statusPublished - Jan 26 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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