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We report enhanced superconductivity in bilayer thin films consisting ofsuperconducting La$_{1.6-x}$Nd$_{0.4}$Sr$_{x}$CuO$_{4}$ with 0.06 $\leq x<$0.20 and metallic but non-superconducting La$_{1.55}$Sr$_{0.45}$CuO$_{4}$.These bilayers show a maximum increase in superconducting transitiontemperature ($T_c$) of more than 200% for $x$ = 0.06 while no change in $T_c$is observed for the bilayers with $x\geq$ 0.20. The analysis of the criticalcurrent and kinetic inductance data suggests 2-3 unit cells thick interfaciallayer electronically perturbed to have a higher $T_c$. A simple charge transfermodel with cation intermixing explains the observed $T_c$ in bilayers. Stillthe unusually large thickness of interfacial superconducting layers can not beexplained in terms of this model. We believe the stripe relaxation as well asthe proximity effect also influence the superconductivity of the interface.

europhysics letters

Electronic reconstruction and enhanced superconductivity at  La$_{1.6-x}$Nd$_{0.4}$Sr$_{x}$CuO$_{4}$/La$_{1.55}$Sr$_{0.45}$CuO$_{4}$  bilayer interface