The upper critical field and its anisotropy in LiFeAs

Details The upper critical field and its anisotropy in LiFeAs The upper critical field and its anisotropy in LiFeAs

2011-01-17

arxiv.org/abs/1101.3159v1

Phys. Rev. B 83, 174506 (2011)

Physics

Condensed Matter

Superconductivity

5 pages,5 figures

Scientific paper

10.1103/PhysRevB.83.174506

The upper critical field $\mu_0H_{c2}(T_c)$ of LiFeAs single crystals has been determined by measuring the electrical resistivity using the facilities of pulsed magnetic field at Los Alamos. We found that $\mu_0H_{c2}(T_c)$ of LiFeAs shows a moderate anisotropy among the layered iron-based superconductors; its anisotropic parameter $\gamma$ monotonically decreases with decreasing temperature and approaches $\gamma\simeq 1.5$ as $T\rightarrow 0$. The upper critical field reaches 15T ($H\parallel c$) and 24.2T ($H\parallel ab$) at $T=$1.4K, which value is much smaller than other iron-based high $T_c$ superconductors. The temperature dependence of $\mu_0H_{c2}(T_c)$ can be described by the Werthamer-Helfand-Hohenberg (WHH) method, showing orbitally and (likely) spin-paramagnetically limited upper critical field for $H\parallel c$ and $H\parallel ab$, respectively.

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