| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 |
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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.
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Received: 10 November 2022
Revised: 22 April 2023
Accepted manuscript online: 10 May 2023
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PACS:
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74.20.De
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(Phenomenological theories (two-fluid, Ginzburg-Landau, etc.))
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74.20.Rp
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(Pairing symmetries (other than s-wave))
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74.78.-w
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(Superconducting films and low-dimensional structures)
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| Fund: It is a great pleasure to thank Professor H. Huang for patient guidance and helpful discussion. |
Corresponding Authors:
Jian-Tao Che
E-mail: chejt2013@163.com
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Cite this article:
Jian-Tao Che(车剑韬) and Chen-Xiao Ye(叶晨骁) Multi-band analysis on physical properties of superconducting FeSe films 2023 Chin. Phys. B 32 097401
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