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Anisotropic Superconductivity of Ca1-xLaxFeAs2 (x ~ 0.18) Single Crystal

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arxiv 1405.6558 v1 pith:IDAVMH6B submitted 2014-05-26 cond-mat.supr-con

Anisotropic Superconductivity of Ca1-xLaxFeAs2 (x ~ 0.18) Single Crystal

Wei Zhou , Jincheng Zhuang , Feifei Yuan , Xiong Li , Xiangzhuo Xing , Yue Sun , Zhixiang Shi This is my paper
classification cond-mat.supr-con
keywords anisotropicgammaca1-xlaxfeas2criticalcrystalfieldindicatingndfeaso1-xfx
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Anisotropic superconducting properties including the upper critical field Hc2, thermal activation energy U0, and critical current density Jc are systematically studied in a large Ca1-xLaxFeAs2 single crystal (x ~ 0.18). The obtained Hc2 bears a moderate anisotropy gamma of approximately 2-4.2, located between those of '122' Ba1-xKxFe2As2 (1 < gamma < 2) and '1111' NdFeAsO1-xFx (5 < gamma < 9.2). Both the magnitude of U0 and its field dependence are very similar to those of NdFeAsO1-xFx, also indicating anisotropic superconductivity. Moreover, high and anisotropic Jc's exceeding 10^5 A/cm2 have been calculated from the magnetization hysteresis loops, indicating the existence of strong bulk-dominated pinning in the present superconducting material.

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