Charge-fluctuation mechanism of high-Tc superconductivity and the isotope effect in oxide superconductors

M. Tachiki; S. Takahashi

doi:10.1103/PhysRevB.39.293

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Charge-fluctuation mechanism of high-Tc superconductivity and the isotope effect in oxide superconductors

M. Tachiki, S. Takahashi

DOI 10.1103/PhysRevB.39.293 · Physical Review B

T1

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Abstract

In connection with high-Tc superconductivity, superconductivity in a system of Fermi particles interacting via a pairing interaction mediated by charge fluctuation and LO phonons is theoretically studied. The anomaly observed in the LO phonon dispersion of the oxides suggests that the electronic dielectric constants with certain wave numbers are negative due to the strong Coulomb correlation. The superconducting transition temperature Tc of the system calculated by an Eliashberg-type equation is unusually high and the isotope effect for Tc is very weak.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown