The combination of strongly coupled Cooper pairs and weak superconducting fluctuations is an important prerequisite for achieving high-temperature superconductivity. The review is devoted to the implementation of this condition in multiband superconductors, in which strongly coupled pairs in the shallow conduction band (the Fermi level is close to the band edge) coexist with ordinary, weakly fluctuating Cooper pairs formed in the deep band. As a result of the Josephson coupling between condensates in different bands, such a system is characterized by a high critical coherence temperature due to the presence of strongly coupled pairs and the suppression of superconducting fluctuations. This suppression does not require any special preconditions, and is almost total even if the Josephson coupling between the bands is weak.
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05 March 2024
An Erratum to this paper has been published: https://doi.org/10.1134/S0021364024020012
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Funding
The work was carried out within the framework of the “Priority 2030” program of the National Research Nuclear University MEPhI, and was also supported by the Ministry of Science and Higher Education of the Russian Federation (state task project no. FSWU-2023-0031). Arkady Shanenko and Alexei Vagov thank the Basic Research Program of the HSE Research University that was used to calculate the critical temperature shift. Vasily Stolyarov thanks for the support of the Russian Science Foundation (project no. 21-72-30026 https://rscf.ru/en/project/21-72-30026) and the Ministry of Science and Higher Education of the Russian Federation (state task project no. FSMG-2023-0014).
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Krasavin, A.V., Vagov, A.V., Vasenko, A.S. et al. Suppression of Superconducting Fluctuations in Multiband Superconductors as a Mechanism for Increasing the Critical Temperature (Brief Review). Jetp Lett. 119, 233–250 (2024). https://doi.org/10.1134/S0021364023603755
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DOI: https://doi.org/10.1134/S0021364023603755