Anisotropy of Ca0.73La0.27(Fe0.96Co0.04)As2 studied by torque magnetometry

doi:10.1088/1674-1056/ab9f26

中国物理B ›› 2020, Vol. 29 ›› Issue (9): 97405-097405.doi: 10.1088/1674-1056/ab9f26

Anisotropy of Ca_0.73La_0.27(Fe_0.96Co_0.04)As₂ studied by torque magnetometry

Ya-Lei Huang(黄亚磊), Run Yang(杨润), Pei-Gang Li(李培刚), Hong Xiao(肖宏)

1 Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China;
2 Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China;
3 Laboratorium für Festkörperphysik, ETH-Zürich, 8093, Zürich, Switzerland;
4 Department of Physics, Beijing University of Posts and Telecommunications, Beijing 100876, China

收稿日期:2020-06-06 修回日期:2020-06-12 接受日期:2020-06-23 出版日期:2020-09-05 发布日期:2020-09-05
通讯作者: Pei-Gang Li, Hong Xiao E-mail:pgli@bupt.edu.cn;hong.xiao@hpstar.ac.cn
基金资助:
Project supported by NSAF, China (Grant No. U1530402). P. G. Li acknowledges the support of the National Natural Science Foundation of China (Grant No. 51572241).

Anisotropy of Ca_0.73La_0.27(Fe_0.96Co_0.04)As₂ studied by torque magnetometry

Ya-Lei Huang(黄亚磊)^1,2, Run Yang(杨润)³, Pei-Gang Li(李培刚)^1,4, Hong Xiao(肖宏)²

1 Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China;
2 Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China;
3 Laboratorium für Festkörperphysik, ETH-Zürich, 8093, Zürich, Switzerland;
4 Department of Physics, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2020-06-06 Revised:2020-06-12 Accepted:2020-06-23 Online:2020-09-05 Published:2020-09-05
Contact: Pei-Gang Li, Hong Xiao E-mail:pgli@bupt.edu.cn;hong.xiao@hpstar.ac.cn
Supported by:
Project supported by NSAF, China (Grant No. U1530402). P. G. Li acknowledges the support of the National Natural Science Foundation of China (Grant No. 51572241).

摘要/Abstract

摘要： Torque measurements were performed on single crystal samples of Ca_0.73La_0.27(Fe_0.96Co_0.04)As₂ in both the normal and superconducting states. Contributions to the torque signal from the paramagnetism and the vortex lattice were identified. The superconducting anisotropy parameter γ was determined from the reversible part of the vortex contribution based on Kogan's model. It is found that γ ≈ 7.5 at t=T/T_c=0.85, which is smaller than the result of CaFe_0.88Co_0.12AsF γ ≈ 15 at t=0.83, but larger than the result of 11 and 122 families, where γ stays in the range of 2-3. The moderate anisotropy of this 112 iron-based superconductor fills the gap between 11, 122 families and 1111 families. In addition, we found that the γ shows a temperature dependent behavior, i.e., decreasing with increasing temperature. The fact that γ is not a constant point towards a multiband scenario in this compound.

关键词: torque, anisotropy parameter, superconductivity

Abstract: Torque measurements were performed on single crystal samples of Ca_0.73La_0.27(Fe_0.96Co_0.04)As₂ in both the normal and superconducting states. Contributions to the torque signal from the paramagnetism and the vortex lattice were identified. The superconducting anisotropy parameter γ was determined from the reversible part of the vortex contribution based on Kogan's model. It is found that γ ≈ 7.5 at t=T/T_c=0.85, which is smaller than the result of CaFe_0.88Co_0.12AsF γ ≈ 15 at t=0.83, but larger than the result of 11 and 122 families, where γ stays in the range of 2-3. The moderate anisotropy of this 112 iron-based superconductor fills the gap between 11, 122 families and 1111 families. In addition, we found that the γ shows a temperature dependent behavior, i.e., decreasing with increasing temperature. The fact that γ is not a constant point towards a multiband scenario in this compound.

Key words: torque, anisotropy parameter, superconductivity

中图分类号: (Magnetic properties including vortex structures and related phenomena)

74.25.Ha

74.25.Op (Mixed states, critical fields, and surface sheaths) 74.70.Xa (Pnictides and chalcogenides)

黄亚磊, 杨润, 李培刚, 肖宏. Anisotropy of Ca_0.73La_0.27(Fe_0.96Co_0.04)As₂ studied by torque magnetometry[J]. 中国物理B, 2020, 29(9): 97405-097405.

Ya-Lei Huang(黄亚磊), Run Yang(杨润), Pei-Gang Li(李培刚), Hong Xiao(肖宏). Anisotropy of Ca_0.73La_0.27(Fe_0.96Co_0.04)As₂ studied by torque magnetometry[J]. Chin. Phys. B, 2020, 29(9): 97405-097405.

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Anisotropy of Ca_0.73La_0.27(Fe_0.96Co_0.04)As₂ studied by torque magnetometry

Anisotropy of Ca_0.73La_0.27(Fe_0.96Co_0.04)As₂ studied by torque magnetometry

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