Nonvanishing Eliashberg gap function in YBa2Cu3O7 above Tc
This paper presents the numerical solution of the temperature dependent Eliashberg gap equations on the real axis for anisotropic superconductor YBa2Cu3O7 (YBCO) for below and above the calculated Tc. In those numerical calculations, the results of the first-principles electronic structure of YBCO w...
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-12-01
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| Series: | Physics Open |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666032625000547 |
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| Summary: | This paper presents the numerical solution of the temperature dependent Eliashberg gap equations on the real axis for anisotropic superconductor YBa2Cu3O7 (YBCO) for below and above the calculated Tc. In those numerical calculations, the results of the first-principles electronic structure of YBCO were integrated into the Eliashberg gap equations based on the theory of many-body physics for superconductivity. As demonstrated previously,[1] the calculated Tc for YBCO was about 89 K for μ∗ = 0.1, which was quite close to that of experimental observations. For T < Tc, there is a large anisotropy of superconducting gap on the Fermi surface of YBCO.[2,3] Furthermore, above Tc, such as 105 K, it was found that the real part of gap function is not zero at finite frequency, although for the frequency near 0, the real part of gap function is zero. The results may be used to understand some pseudogap state properties in the material. |
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| ISSN: | 2666-0326 |