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http://dx.doi.org/10.9714/psac.2014.16.4.026

Anisotropic superconductivity of high quality FeSe1-x Single crystal  

Kwon, Chang Il (Department of Physics, Pohang University of Science and Technology)
Ok, Jong Mok (Department of Physics, Pohang University of Science and Technology)
Kim, Jun Sung (Department of Physics, Pohang University of Science and Technology)
Publication Information
Progress in Superconductivity and Cryogenics / v.16, no.4, 2014 , pp. 26-30 More about this Journal
Abstract
We investigate the upper critical field anisotropy ${\Gamma}_H$ and the magnetic penetration depth anisotropy ${\Gamma}_{\lambda}$ of a high-quality $FeSe_{1-x}$ single crystal using angular dependent resistivity and torque magnetometry up to 14 T. High quality single crystals of $FeSe_{1-x}$ were successfully grown using $KCl-AlCl_3$ flux method, which shows a sharp superconducting transition at $T_C{\sim}9K$ and a high residual resistivity ratio of ~ 25. We found that the anisotropy ${\Gamma}_H$ near $T_C$ is a factor of two larger than found in the poor-quality crystals, indicating anisotropic 3D superconductivity of $FeSe_{1-x}$. Similar to the 1111-type Fe pnictides, the anisotropies ${\Gamma}_{\lambda}$ and ${\Gamma}_H$ show distinct temperature dependence; ${\Gamma}_H$ decreases but ${\Gamma}_{\lambda}$ increases with lowering temperature. These behaviors can be attributed to multi-band superconductivity, but different from the case of $MgB_2$. Our findings suggest that the opposite temperature dependence of ${\Gamma}_{\lambda}$ and ${\Gamma}_H$ is the common properties of Fe-based superconductors.
Keywords
Fe based superconductor; Single crystal; Upper critical field; Penetration depth;
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