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

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

2011-07-21

arxiv.org/abs/1107.4375v2

Physics

Condensed Matter

Superconductivity

This version includes new higher resolution data. 4 pages with figures

Scientific paper

10.1016/j.physc.2012.02.049

We report a de Haas-van Alphen (dHvA) oscillation study of the 111 iron pnictide superconductors LiFeAs with T_c ~18K and LiFeP with T_c~5K. We find that for both compounds the Fermi surface topology is in good agreement with density functional band-structure calculations and shows quasi-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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