Superconductivity originating from a repulsive potential: Proposal of a new exciton mechanism of high-Tc superconductivity in the dilute electron gas

Yasutami Takada

doi:10.1103/PhysRevB.39.11575

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Superconductivity originating from a repulsive potential: Proposal of a new exciton mechanism of high-Tc superconductivity in the dilute electron gas

Yasutami Takada

DOI 10.1103/PhysRevB.39.11575 · Physical Review B

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Abstract

We investigate the possibility of superconductivity and estimate the transition temperature Tc in a system in which the bare electron-electron interaction V(q) is arbitrary but basically repulsive. We employ the recently developed variational method which is believed to be the best one for the purpose at present. Through this study, we consider a concept of the Cooper pair originating not from an attractive but rather a repulsive bare potential. We find a special form for V(q) to obtain Tc over 200 K in the dilute electron-gas system. We discuss the band structure near the Fermi surface to produce such V(q)'s and propose a new exciton mechanism.