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- W2023807782 abstract "A negative-U Hubbard-type model with nearest-neighbor weak repulsion is studied in the 1/d expansion, with d being the spatial dimensionality. The leading-order effects in 1/d are ``Kondo''-effect-type local charge fluctuations and mean-field-approximation-type charge-density waves and superconductivity. A ``local'' Kondo temperature ${mathit{T}}_{mathit{K}}$ is defined to show an energy scale of the charge fluctuations, which are responsible for the formation of diamagnetic heavy-electron systems. The bandwidth of the heavy electrons is about 4${mathit{k}}_{mathit{B}}$${mathit{T}}_{mathit{K}}$. Superconductivity occurs when the system is away from half filling. Its critical temperature ${mathit{T}}_{mathit{c}}$ is highest in the crossover regime as a function of ensuremath{Vert}Uensuremath{Vert}, where ensuremath{Vert}Uensuremath{Vert} is as large as the bare bandwidth of electrons. The superconductivity in such a regime is of a crossover type between Cooper pairing and Bose-Einstein condensation. On the basis of Varma's proposal that a negative U results from nonlinear screening [Phys. Rev. Lett. 61, 2713 (1988)], it is argued that superconducting ${mathrm{Ba}}_{mathit{x}}$${mathrm{K}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{BiO}}_{3}$ with ${mathit{T}}_{mathit{c}}$ensuremath{approxeq}30 K are diamagnetic heavy-electron systems with ${mathit{T}}_{mathit{K}}$ensuremath{approxeq}(2--5)ifmmodetimeselsetexttimesfi{}${10}^{3}$ K." @default.
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- W2023807782 date "1992-11-01" @default.
- W2023807782 modified "2023-09-23" @default.
- W2023807782 title "High-temperature superconductivity of diamagnetic heavy electrons: Crossover between Cooper pairing and Bose condensation" @default.
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- W2023807782 doi "https://doi.org/10.1103/physrevb.46.11965" @default.
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