Anisotropic superconducting properties of FeSe0.5Te0.5 single crystals

doi:10.1088/1674-1056/ac5610

中国物理B ›› 2022, Vol. 31 ›› Issue (9): 97402-097402.doi: 10.1088/1674-1056/ac5610

Anisotropic superconducting properties of FeSe_0.5Te_0.5 single crystals

Jia-Ming Zhao(赵佳铭)¹ and Zhi-He Wang(王智河)^2,†

1 School of Physics, Nanjing University, Nanjing 210093, China;
2 Center for Superconducting Physics and Materials, Collaborative Innovation Center of Advanced Microstructures and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

收稿日期:2021-11-30 修回日期:2022-01-21 接受日期:2022-02-17 出版日期:2022-08-19 发布日期:2022-09-03
通讯作者: Zhi-He Wang E-mail:zhwang@nju.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300401) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000).

Anisotropic superconducting properties of FeSe_0.5Te_0.5 single crystals

Jia-Ming Zhao(赵佳铭)¹ and Zhi-He Wang(王智河)^2,†

1 School of Physics, Nanjing University, Nanjing 210093, China;
2 Center for Superconducting Physics and Materials, Collaborative Innovation Center of Advanced Microstructures and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

Received:2021-11-30 Revised:2022-01-21 Accepted:2022-02-17 Online:2022-08-19 Published:2022-09-03
Contact: Zhi-He Wang E-mail:zhwang@nju.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300401) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000).

摘要/Abstract

摘要： We investigated the anisotropic electrical transport and magnetic properties of FeSe$_{0.5}$Te$_{0.5}$ single crystals grown by the self-flux method. The in-plane resistivity shows a metallic-like temperature dependence, while the out-of-plane resistivity shows a broad hump with a maximum at around 64 K. The magnetization loops for $H/\!/c$-axis and $H/\!/ab$-plane are also different, for example, there is a typical second peak for $H/\!/c$-axis. The in-plane critical current density is larger than the out-of-plane one. The coherence length and penetration depth were estimated by the Ginzburg-Landau theory. The anisotropic parameter $\gamma $ depends on the applied magnetic field and the temperature. The coupling of superconducting FeSe(Te) layers and the flux pinning mechanism relevant to anisotropy are also discussed.

关键词: FeSe_1-xTe_x single crystal, anisotropy, resistivity, magnetization

Abstract: We investigated the anisotropic electrical transport and magnetic properties of FeSe$_{0.5}$Te$_{0.5}$ single crystals grown by the self-flux method. The in-plane resistivity shows a metallic-like temperature dependence, while the out-of-plane resistivity shows a broad hump with a maximum at around 64 K. The magnetization loops for $H/\!/c$-axis and $H/\!/ab$-plane are also different, for example, there is a typical second peak for $H/\!/c$-axis. The in-plane critical current density is larger than the out-of-plane one. The coherence length and penetration depth were estimated by the Ginzburg-Landau theory. The anisotropic parameter $\gamma $ depends on the applied magnetic field and the temperature. The coupling of superconducting FeSe(Te) layers and the flux pinning mechanism relevant to anisotropy are also discussed.

Key words: FeSe_1-xTe_x single crystal, anisotropy, resistivity, magnetization

中图分类号: (Properties of superconductors)

74.25.-q

74.25.F- (Transport properties) 74.25.Sv (Critical currents) 74.25.Wx (Vortex pinning (includes mechanisms and flux creep))

Jia-Ming Zhao(赵佳铭) and Zhi-He Wang(王智河). Anisotropic superconducting properties of FeSe_0.5Te_0.5 single crystals[J]. 中国物理B, 2022, 31(9): 97402-097402.

Jia-Ming Zhao(赵佳铭) and Zhi-He Wang(王智河). Anisotropic superconducting properties of FeSe_0.5Te_0.5 single crystals[J]. Chin. Phys. B, 2022, 31(9): 97402-097402.

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Anisotropic superconducting properties of FeSe_0.5Te_0.5 single crystals

Anisotropic superconducting properties of FeSe_0.5Te_0.5 single crystals

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