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- W4310263224 abstract "Phonon softening is a ubiquitous phenomenon in condensed matter systems which is usually associated with charge density wave (CDW) instabilities and anharmonicity. The interplay between phonon softening, CDW and superconductivity is a topic of intense debate. In this work, the effects of anomalous soft phonon instabilities on superconductivity are studied based on a recently developed theoretical framework that accounts for phonon damping and softening within the Migdal-Eliashberg theory. Model calculations show that the phonon softening in the form of a sharp dip in the phonon dispersion relation, either acoustic or optical (including the case of Kohn-type anomalies typically associated with CDW), can cause a manifold increase of the electron-phonon coupling constant $lambda$. This, under certain conditions, which are consistent with the concept of optimal frequency introduced by Bergmann and Rainer, can produce a large increase of the superconducting transition temperature $T_c$. In summary, our results suggest the possibility of reaching high-temperature superconductivity by exploiting soft phonon anomalies restricted in momentum space." @default.
- W4310263224 created "2022-11-30" @default.
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- W4310263224 date "2022-11-22" @default.
- W4310263224 modified "2023-09-27" @default.
- W4310263224 title "Sharp Kohn-like phonon anomalies due to charge order can strongly enhance the superconducting $T_c$" @default.
- W4310263224 doi "https://doi.org/10.48550/arxiv.2211.12015" @default.
- W4310263224 hasPublicationYear "2022" @default.
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