Multi-band analysis on physical properties of superconducting FeSe films

doi:10.1088/1674-1056/acd3e5

中国物理B ›› 2023, Vol. 32 ›› Issue (9): 97401-097401.doi: 10.1088/1674-1056/acd3e5

Multi-band analysis on physical properties of superconducting FeSe films

Jian-Tao Che(车剑韬)^1,† and Chen-Xiao Ye(叶晨骁)²

1 Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China;
2 School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China

收稿日期:2022-11-10 修回日期:2023-04-22 接受日期:2023-05-10 发布日期:2023-08-28
通讯作者: Jian-Tao Che E-mail:chejt2013@163.com
基金资助:
It is a great pleasure to thank Professor H. Huang for patient guidance and helpful discussion.

Multi-band analysis on physical properties of superconducting FeSe films

Jian-Tao Che(车剑韬)^1,† and Chen-Xiao Ye(叶晨骁)²

1 Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, China;
2 School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China

Received:2022-11-10 Revised:2023-04-22 Accepted:2023-05-10 Published:2023-08-28
Contact: Jian-Tao Che E-mail:chejt2013@163.com
Supported by:
It is a great pleasure to thank Professor H. Huang for patient guidance and helpful discussion.

摘要/Abstract

摘要： The origins of superconductivity and pairing symmetry of order parameters are still controversial problems for FeSe thin films up to date. Under the Neumann boundary conditions, the electromagnetic properties of this system are investigated using the two-band Ginzburg-Landau theory. We calculate the temperature dependence of upper critical field in arbitrary direction and critical supercurrent density through the FeSe film. It is revealed that the normalized upper critical field is independent of the film thickness and all of our theoretical results are in accordance with the experimental data. These thus strongly indicate the existence of two-gap s-wave superconductivity in this material.

关键词: Ginzburg-Landau theory, two-band s-wave superconductivity, FeSe film

Abstract: The origins of superconductivity and pairing symmetry of order parameters are still controversial problems for FeSe thin films up to date. Under the Neumann boundary conditions, the electromagnetic properties of this system are investigated using the two-band Ginzburg-Landau theory. We calculate the temperature dependence of upper critical field in arbitrary direction and critical supercurrent density through the FeSe film. It is revealed that the normalized upper critical field is independent of the film thickness and all of our theoretical results are in accordance with the experimental data. These thus strongly indicate the existence of two-gap s-wave superconductivity in this material.

Key words: Ginzburg-Landau theory, two-band s-wave superconductivity, FeSe film

中图分类号: (Phenomenological theories (two-fluid, Ginzburg-Landau, etc.))

74.20.De

74.20.Rp (Pairing symmetries (other than s-wave)) 74.78.-w (Superconducting films and low-dimensional structures)

Jian-Tao Che(车剑韬) and Chen-Xiao Ye(叶晨骁). Multi-band analysis on physical properties of superconducting FeSe films[J]. 中国物理B, 2023, 32(9): 97401-097401.

Jian-Tao Che(车剑韬) and Chen-Xiao Ye(叶晨骁). Multi-band analysis on physical properties of superconducting FeSe films[J]. Chin. Phys. B, 2023, 32(9): 97401-097401.

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Multi-band analysis on physical properties of superconducting FeSe films

Multi-band analysis on physical properties of superconducting FeSe films

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