Chinese Physics B, Volume. 29, Issue 9, (2020)

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

Ya-Lei Huang1,2, Run Yang3, Pei-Gang Li1,4、†, and Hong Xiao2
Author Affiliations
  • 1Department of Physics, Zhejiang Sci-Tech University, Hangzhou 3008, China
  • 2Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China
  • 3Laboratorium für Festkörperphysik, ETH–Zürich, 809, Zürich, Switzerland
  • 4Department of Physics, Beijing University of Posts and Telecommunications, Beijing 100876, China
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    Torque measurements were performed on single crystal samples of Ca0.73La0.27(Fe0.96Co0.04)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/Tc = 0.85, which is smaller than the result of CaFe0.88Co0.12AsF 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.

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    Ya-Lei Huang, Run Yang, Pei-Gang Li, Hong Xiao. Anisotropy of Ca0.73La0.27(Fe0.96Co0.04)As2 studied by torque magnetometry[J]. Chinese Physics B, 2020, 29(9):

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    Paper Information

    Received: Jun. 6, 2020

    Accepted: --

    Published Online: Apr. 29, 2021

    The Author Email: Li Pei-Gang (hong.xiao@hpstar.ac.cn)

    DOI:10.1088/1674-1056/ab9f26

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