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Open AccessArticle

Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems

National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
Condens. Matter 2019, 4(2), 57; https://doi.org/10.3390/condmat4020057
Received: 25 April 2019 / Revised: 13 June 2019 / Accepted: 15 June 2019 / Published: 19 June 2019
(This article belongs to the Special Issue From cuprates to Room Temperature Superconductors)
It is very important to elucidate the mechanism of superconductivity for achieving room temperature superconductivity. In the first half of this paper, we give a brief review on mechanisms of superconductivity in many-electron systems. We believe that high-temperature superconductivity may occur in a system with interaction of large-energy scale. Empirically, this is true for superconductors that have been found so far. In the second half of this paper, we discuss cuprate high-temperature superconductors. We argue that superconductivity of high temperature cuprates is induced by the strong on-site Coulomb interaction, that is, the origin of high-temperature superconductivity is the strong electron correlation. We show the results on the ground state of electronic models for high temperature cuprates on the basis of the optimization variational Monte Carlo method. A high-temperature superconducting phase will exist in the strongly correlated region. View Full-Text
Keywords: strongly correlated electron systems; mechanisms of superconductivity; high-temperature superconductivity; kinetic driven superconductivity; optimization variational Monte Carlo method; Hubbard model; three-band d-p model strongly correlated electron systems; mechanisms of superconductivity; high-temperature superconductivity; kinetic driven superconductivity; optimization variational Monte Carlo method; Hubbard model; three-band d-p model
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Yanagisawa, T. Mechanism of High-Temperature Superconductivity in Correlated-Electron Systems. Condens. Matter 2019, 4, 57.

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