Giant defect-enhanced electron-phonon interactions in ternary copper oxide superconductors

J. C. Phillips

doi:10.1103/PhysRevLett.59.1856

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Giant defect-enhanced electron-phonon interactions in ternary copper oxide superconductors

J. C. Phillips

DOI 10.1103/PhysRevLett.59.1856 · Physical Review Letters

T1

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Abstract

A microscopic but schematic model is discussed for defects (such as oxygen vacancies O□) in compounds such as YBa2Cu3O7+δO2−δ□ and La3−xBa3+xCu6O14−δO4−δ□ in relation to the superconductive properties of these materials. The discussion shows in detail how Tc can reach its maximum value at or near the metal-semiconductor transition Tms. It introduces a new mechanism for enhancing of electron-phonon interactions that is separate from, and empirically superior to, Fermi-surface nesting.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La3-xBa3+xCu6O14+δO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	onset
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	unknown
La2.25Ba3.75Cu6O16O2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown