de Haas-van Alphen study of the Fermi surfaces of superconducting LiFeP and LiFeAs

We report a de Haas-van Alphen oscillation study of the 111 iron pnictide superconductors LiFeAs with T(c) ≈ 18 K and LiFeP with T(c) ≈ 5 K. We find that for both compounds the Fermi surface topology is in good agreement with density functional band-structure calculations and has almost nested elect...

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Bibliographic Details
Published in:Physical review letters 2012-01, Vol.108 (4), p.047002-047002, Article 047002
Main Authors: Putzke, C, Coldea, A I, Guillamón, I, Vignolles, D, McCollam, A, Leboeuf, D, Watson, M D, Mazin, I I, Kasahara, S, Terashima, T, Shibauchi, T, Matsuda, Y, Carrington, A
Format: Article
Language:English
Subjects:
Condensed Matter
Physics
Superconductivity
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Summary:We report a de Haas-van Alphen oscillation study of the 111 iron pnictide superconductors LiFeAs with T(c) ≈ 18 K and LiFeP with T(c) ≈ 5 K. 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.047002