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

doi:10.1088/1674-1056/ab9f26

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.

Keywords: torque anisotropy parameter superconductivity

Received: 06 June 2020
Revised: 12 June 2020
Accepted manuscript online: 23 June 2020

PACS:	74.25.Ha	(Magnetic properties including vortex structures and related phenomena)
	74.25.Op	(Mixed states, critical fields, and surface sheaths)
	74.70.Xa	(Pnictides and chalcogenides)

Fund: 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).

Corresponding Authors: Pei-Gang Li, Hong Xiao
E-mail: pgli@bupt.edu.cn;hong.xiao@hpstar.ac.cn

Cite this article:

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 2020 Chin. Phys. B 29 097405

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

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