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Two-band and pauli-limiting effects on the upper critical field of 112-type iron pnictide superconductors.

ABSTRACT: The temperature dependence of upper critical field μ0Hc2 of Ca0.83La0.17FeAs2 and Ca0.8La0.2Fe0.98Co0.02As2 single crystals are investigated by measuring the resistivity for the inter-plane (H//c) and in-plane (H//ab) directions in magnetic fields up to 60 T. It is found that μ0Hc2(T) of both crystals for H//c presents a sublinear temperature dependence with decreasing temperature, whereas the curve of μ0Hc2(T) for H//ab has a convex curvature and gradually tends to saturate at low temperatures. μ0Hc2(T) in both crystals deviates from the conventional Werthamer-Helfand-Hohenberg (WHH) theoretical model without considering spin paramagnetic effect for H//c and H//ab directions. Detailed analyses show that the behavior of μ0Hc2(T) in 112-type Iron-based superconductors (IBSs) is similar to that of most IBSs. Two-band model is required to fully reproduce the behavior of μ0Hc2(T) for H//c, while the effect of spin paramagnetic effect is responsible for the behavior of μ0Hc2(T) for H//ab.

SUBMITTER: Xing X 

PROVIDER: S-EPMC5382916 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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Two-band and pauli-limiting effects on the upper critical field of 112-type iron pnictide superconductors.

Xing Xiangzhuo X   Zhou Wei W   Wang Jinhua J   Zhu Zengwei Z   Zhang Yufeng Y   Zhou Nan N   Qian Bin B   Xu Xiaofeng X   Shi Zhixiang Z  

Scientific reports 20170406

The temperature dependence of upper critical field μ<sub>0</sub>H<sub>c2</sub> of Ca<sub>0.83</sub>La<sub>0.17</sub>FeAs<sub>2</sub> and Ca<sub>0.8</sub>La<sub>0.2</sub>Fe<sub>0.98</sub>Co<sub>0.02</sub>As<sub>2</sub> single crystals are investigated by measuring the resistivity for the inter-plane (H//c) and in-plane (H//ab) directions in magnetic fields up to 60 T. It is found that μ<sub>0</sub>H<sub>c2</sub>(T) of both crystals for H//c presents a sublinear temperature dependence with decreas  ...[more]

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