Small anisotropy of the lower critical field and $s_\pm$-wave two-gap feature in single crystal LiFeAs

Details Small anisotropy of the lower critical field and $s_\pm$-wave two-gap feature in single crystal LiFeAs Small anisotropy of the lower critical field and $s_\pm$-wave two-gap feature in single crystal LiFeAs

2010-07-28

arxiv.org/abs/1007.4906v2

EPL,94 (2011) 57008

Physics

Condensed Matter

Superconductivity

10 pages, 5 figures

Scientific paper

10.1209/0295-5075/94/57008

The in- and out-of-plane lower critical fields and magnetic penetration depths for LiFeAs were examined. The anisotropy ratio $\gamma_{H_{c1}}(0)$ is smaller than the expected theoretical value, and increased slightly with increasing temperature from 0.6$T_c$ to $T_c$. This small degree of anisotropy was numerically confirmed by considering electron correlation effect. The temperature dependence of the penetration depths followed a power law($\sim$$T^n$) below 0.3$T_c$, with $n$$>$3.5 for both $\lambda_{ab}$ and $\lambda_c$. Based on theoretical studies of iron-based superconductors, these results suggest that the superconductivity of LiFeAs can be represented by an extended $s_\pm$-wave due to weak impurity scattering effect. And the magnitudes of the two gaps were also evaluted by fitting the superfluid density for both the in- and out-of-plane to the two-gap model. The estimated values for the two gaps are consistent with the results of angle resolved photoemission spectroscopy and specific heat experiments.

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