Superheating fields of semi-infinite superconductors and layered superconductors in the diffusive limit: structural optimization based on the microscopic theory
| Autor: | Kubo, Takayuki |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Supercond. Sci. Technol. 34, 045006 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1361-6668/abdedd |
| Popis: | We investigate the superheating fields $H_{sh}$ of semi-infinite superconductors and layered superconductors in the diffusive limit by using the well-established quasiclassical Green's function formalism of the BCS theory. The coupled Maxwell-Usadel equations are self-consistently solved to obtain the spatial distributions of the magnetic field, screening current density, penetration depth, and pair potential. We find the superheating field of a semi-infinite superconductor in the diffusive limit is given by $H_{sh} = 0.795 H_{c0}$ at the temperature $T \to 0$. Here $H_{c0}$ is the thermodynamic critical-field at the zero temperature. Also, we evaluate $H_{sh}$ of layered superconductors in the diffusive limit as functions of the layer thicknesses ($d$) and identify the optimum thickness that maximizes $H_{sh}$ for various materials combinations. Qualitative interpretation of $H_{sh}(d)$ based on the London approximation is also discussed. The results of this work can be used to improve the performance of superconducting rf resonant cavities for particle accelerators. Comment: 9 pages, 5 figures |
| Databáze: | arXiv |
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