Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.187001
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Funding
- DFG [BE 1749/12]
- EPSRC UK
- Ministry of Science and Education of Russian Federation [P-279]
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We report superconducting (SC) properties of stoichiometric LiFeAs (T-c = 17 K) studied by small-angle neutron scattering (SANS) and angle-resolved photoemission (ARPES). Although the vortex lattice exhibits no long-range order, well-defined SANS rocking curves indicate better ordering than in chemically doped 122 compounds. The London penetration depth lambda(ab)(0) = 210 +/- 20 nm, determined from the magnetic field dependence of the form factor, is compared to that calculated from the ARPES band structure with no adjustable parameters. The temperature dependence of lambda(ab) is best described by a single isotropic SC gap Delta(0) = 3.0 +/- 0.2 meV, which agrees with the ARPES value of Delta(ARPES)(0) = 3.1 +/- 0.3 meV and corresponds to the ratio 2 Delta/k(B)T(c) = 4.1 +/- 0.3, approaching the weak-coupling limit predicted by the BCS theory. This classifies LiFeAs as a weakly coupled single-gap superconductor.
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