Journal
PHYSICAL REVIEW B
Volume 83, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.060502
Keywords
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Funding
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-07CH11358]
- US Department of Energy [ER46214]
- Basic Science Research Program [2010-0007487]
- Mid-career Researcher Program [R01-2008-000-20586-0]
- Alfred P. Sloan Foundation
- NSF [NSF-DMR-0084173]
- State of Florida
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Measurements of the temperature and angular dependencies of the upper critical field H-c2 of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Complete H-c2(parallel to c)(T) and H-c2(perpendicular to c)(T) functions with H-c2(parallel to c)(0) = 17 +/- 1 T, H-c2(perpendicular to c) (0) = 26 +/- 1 T, and the anisotropy parameter gamma(H)(T) equivalent to H-c2(perpendicular to c) / H-c2(parallel to c) decreasing from 2.5 at T-c to 1.5 at T << T-c were obtained. The results for both orientations are in excellent agreement with a theory of H-c2 for two-band s(+/-) pairing in the clean limit. We show that H-c2(parallel to c)(T) is mostly limited by the orbital pair breaking, whereas the shape of H-c2(perpendicular to c)(T) indicates strong paramagnetic Pauli limiting and the inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state below T-F similar to 5 K.
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