Lattice-instability-enhanced high-temperature superconductivity for the perovskite-family oxides

Mitsuo Kataoka

doi:10.1103/PhysRevB.37.143

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Lattice-instability-enhanced high-temperature superconductivity for the perovskite-family oxides

Mitsuo Kataoka

DOI 10.1103/PhysRevB.37.143 · Physical Review B

T1

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Abstract

For a possible origin of the high superconducting transition temperature Tc in the perovskitefamily oxides, we propose a mechanism in which superconductivity is enhanced by a lattice instability. When two nearly degenerate bands overlapping the Fermi energy εF become unstable against spontaneous splitting because of the presence of electron-phonon coupling, two electrons in the same band attract each other strongly as a reaction of the strong effective repulsion between two electrons in different band. This model is consistent with the observed fact that the high Tc appears near the electronic or structural transition in the mixed perovskite compounds. Guides for a higher Tc are discussed on the basis of the present mechanism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xMxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	onset
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown