Anomalous Enhancement of the Superconducting Transition Temperature in Electron-Doped Cuprate Heterostructures

Abstract

The superconducting transition temperature $T_c$ of multilayers of electron-doped cuprates, composed of underdoped (or undoped) and overdoped La% ${}_{2-x}$Ce${}_x$CuO${}_4$ (LCCO) and Pr${}_{2-x}$Ce${}_x$CuO${}_4$ (PCCO) thin films, is found to increase significantly with respect to the $T_c$ of the corresponding single-phase films. By investigating the critical current density of superlattices with different doping levels and layer thicknesses, we find that the $T_c$ enhancement is caused by a redistribution of charge over an anomalously large distance.

4 figures. To appear in PRB as a Rapid Communication

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Cited by in corpus (9)

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• Mott p-n Junctions in layered materials
• Emergence of high-temperature superconductivity at the interface of two Mott insulators
• Enhancement of the critical temperature in cuprate superconductors by inhomogeneous doping
• 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
• A conducting nano-filament (CNF) network as a precursor to the origin of superconductivity in electron-doped copper oxides
• A close look at antiferromagnetism in multidimensional phase diagram of electron-doped copper oxide