High-Tc superconductivity at twin boundaries in a Landau-Ginzburg superconductor oxide model

A. Robledo; C. Varea

doi:10.1103/PhysRevB.37.631

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High-Tc superconductivity at twin boundaries in a Landau-Ginzburg superconductor oxide model

A. Robledo, C. Varea

DOI 10.1103/PhysRevB.37.631 · Physical Review B

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Abstract

We analyze the properties of a model YBa2Cu3O9−y system by means of a Landau-Ginzburg free-energy model with coupled superconducting and oxygen-vacancy order parameters. When bulk superconductivity takes place (at T<Tc0) below the oxygen-vacancy ordering temperature (at T0) a purely interfacial superconducting transition at vacancy inhomogeneities generated by twin boundaries in orthorhombic crystals occurs at Tctwin>Tc0. We estimate parameters that give T0∼900 K, Tc0∼40 K, and Tctwin∼100 K when vacancies on the copper planes reach ∼45%.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O9-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown
YBa2Cu3O9-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	100	Pressure not reported	unknown
YBa2Cu3O9-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	zero_resistance