Anomalous enhancement of the superconducting transition temperature of electron-doped La2−xCexCuO4 and Pr2−xCexCuO4 cuprate heterostructures

K. Jin; P. Bach; X. H. Zhang; U. Grupel; E. Zohar; I. Diamant; Y. Dagan; S. Smadici; P. Abbamonte; R. L. Greene

doi:10.1103/PhysRevB.83.060511

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Anomalous enhancement of the superconducting transition temperature of electron-doped La2−xCexCuO4 and Pr2−xCexCuO4 cuprate heterostructures

K. Jin, P. Bach, X. H. Zhang, U. Grupel, E. Zohar, I. Diamant, Y. Dagan, S. Smadici, P. Abbamonte, R. L. Greene

DOI 10.1103/PhysRevB.83.060511 · Physical Review B

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Abstract

The superconducting transition temperature Tc of multilayers of electron-doped cuprates, composed of underdoped (or undoped) and overdoped La2−xCexCuO4 (LCCO) and Pr2−xCexCuO4 (PCCO) thin films, is found to increase significantly with respect to the Tc 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 Tc enhancement is caused by a redistribution of charge over an anomalously large distance.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24	Pressure not reported	onset
Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown