Lower Critical Field, Anisotropy, and Two-Gap Features of LiFeAs

Abstract

The magnetic properties of LiFeAs, as single crystalline and polycrystalline samples, were investigated. The lower critical field deduced from the vortex penetration of two single crystals appears to be almost isotropic with a temperature dependence closer to that of two-gap superconductors. The parameters extracted from the reversible magnetizations of sintered polycrystalline samples are in good agreement with those from the single crystal data.

19 pages, 5 figures

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Cited by in corpus (9)

• Crossover from weak to strong pairing in unconventional superconductors
• Temperature dependence of lower critical field Hc1(T) shows nodeless superconductivity in FeSe
• Weak superconducting pairing and a single isotropic energy gap in stoichiometric LiFeAs
• Evidence for multiple gaps in specific heat of LiFeAs crystals
• Small anisotropy of the lower critical field and $s_{\pm }$-wave two-gap feature in single crystal LiFeAs
• Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap
• Nodeless superconductivity in the presence of spin-density wave in pnictide superconductors: The case of BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)
• Investigation of LiFeAs by means of "Break-junction" Technique