Enhancement of the Superconducting Transition Temperature of La2−xSrxCuO4 Bilayers: Role of Pairing and Phase Stiffness

Ofer Yuli; Itay Asulin; Oded Millo; Dror Orgad; Leonid Iomin; Gad Koren

doi:10.1103/PhysRevLett.101.057005

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Enhancement of the Superconducting Transition Temperature of La2−xSrxCuO4 Bilayers: Role of Pairing and Phase Stiffness

Ofer Yuli, Itay Asulin, Oded Millo, Dror Orgad, Leonid Iomin, Gad Koren

DOI 10.1103/PhysRevLett.101.057005 · Physical Review Letters

T1

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Abstract

The superconducting transition temperature Tc of bilayers comprising underdoped La2−xSrxCuO4 films capped by a thin heavily overdoped metallic La1.65Sr0.35CuO4 layer, is found to increase with respect to Tc of the bare underdoped films. The highest Tc is achieved for x=0.12, close to the “anomalous” 1/8 doping level, and exceeds that of the optimally doped bare film. Our data suggest that the enhanced superconductivity is confined to the interface between the layers. We attribute the effect to a combination of the high pairing scale in the underdoped layer with an enhanced phase stiffness induced by the overdoped film.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32.6	Pressure not reported	onset
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32.5	Pressure not reported	zero_resistance
La1.65Sr0.35CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown