Fundamental limits on the electron-phonon coupling and superconducting $T_c$
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| Format: | Preprint |
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2024
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| _version_ | 1866913973704589312 |
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| author | Semenok, Dmitrii V. Altshuler, Boris L. Yuzbashyan, Emil A. |
| author_facet | Semenok, Dmitrii V. Altshuler, Boris L. Yuzbashyan, Emil A. |
| contents | Fundamental upper bounds on the electron-phonon interaction strength and superconducting transition temperature $T_c$ in metals are established based on the intrinsic instability of the equilibrium between electrons and the crystal lattice under strong interaction. This instability explains why observed electron-phonon coupling constants are limited to $λ\lesssim 4$. The theory also accounts for the mechanism of metastable superconductivity with enhanced $T_c$, which emerges near the instability threshold. Based on theoretical analysis and comparison with experimental data, room-temperature phonon-mediated superconductivity is found to be feasible exclusively in hydrogen compounds. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_12922 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fundamental limits on the electron-phonon coupling and superconducting $T_c$ Semenok, Dmitrii V. Altshuler, Boris L. Yuzbashyan, Emil A. Superconductivity Fundamental upper bounds on the electron-phonon interaction strength and superconducting transition temperature $T_c$ in metals are established based on the intrinsic instability of the equilibrium between electrons and the crystal lattice under strong interaction. This instability explains why observed electron-phonon coupling constants are limited to $λ\lesssim 4$. The theory also accounts for the mechanism of metastable superconductivity with enhanced $T_c$, which emerges near the instability threshold. Based on theoretical analysis and comparison with experimental data, room-temperature phonon-mediated superconductivity is found to be feasible exclusively in hydrogen compounds. |
| title | Fundamental limits on the electron-phonon coupling and superconducting $T_c$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2407.12922 |