Understanding the electric-field enhancement of the superconducting transition temperature for complex oxide interfaces

Jason T. Haraldsen; Peter Wölfle; Alexander V. Balatsky

doi:10.1103/PhysRevB.85.134501

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Understanding the electric-field enhancement of the superconducting transition temperature for complex oxide interfaces

Jason T. Haraldsen, Peter Wölfle, Alexander V. Balatsky

DOI 10.1103/PhysRevB.85.134501 · Physical Review B

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Abstract

We examine the enhancement of the interfacial superconductivity between LaAlO3 and SrTiO3 by an effective electric field. Through the breaking of inversion symmetry at the interface, we show that a term in the free energy, coupling the superfluid density and an electric field, can augment the superconductivity transition temperature. Microscopically, we show that an electric field can also produce changes in the carrier density by relating the measured capacitance to the density of states. Through the standard BCS (Bardeen, Cooper, and Schrieffer) weak-coupling interaction in bulk SrTiO3, we estimate the transition temperature.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaAlO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.2	Pressure not reported	unknown
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.2	Pressure not reported	unknown