期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.047002
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资金
- EPSRC (UK)
- EuroMagNET II under EU [228043]
- JSPS
- National Science Foundation [DMR-0654118]
- State of Florida
- U.S. Department of Energy
- Engineering and Physical Sciences Research Council [EP/G049483/1, EP/H025855/1, EP/I004475/1, EP/I017836/1] Funding Source: researchfish
- EPSRC [EP/I004475/1, EP/H025855/1, EP/I017836/1, EP/G049483/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [20224008, 23654118, 21340099, 20102006, 23102713, 23654119] Funding Source: KAKEN
We report a de Haas-van Alphen oscillation study of the 111 iron pnictide superconductors LiFeAs with T-c approximate to 18 Kand LiFeP with T-c approximate to 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 showsignificant enhancement, up to similar to 3 for LiFeP and similar to 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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