电子-声子耦合和超导超导的基本限制。

IF 26.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2025-07-21 DOI:10.1002/adma.202507013

Dmitrii V Semenok, Boris L Altshuler, Emil A Yuzbashyan

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引用次数: 0

摘要

基于强相互作用下电子与晶格平衡的本征不稳定性，建立了金属中电子-声子相互作用强度和超导转变温度Tc的基本上界。这种不稳定性解释了为什么观测到的电子-声子耦合常数限制在λ > 4。该理论还解释了在不稳定阈值附近出现的Tc增强的亚稳态超导机制。通过理论分析和与实验数据的比较，发现室温声子介导的超导只在氢化合物中是可行的。

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Fundamental Limits on the Electron-Phonon Coupling and Superconducting T_c.

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 ≲ 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.

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.