Comprehensive study of high-T sub(c) interface superconductivity

• Published in: The Journal of physics and chemistry of solids Vol. 71; no. 8; pp. 1098 - 1104
• Main Authors: Logvenov, G, Gozar, A, Butko, VY, Bollinger, A T, Bozovic, N, Radovic, Z, Bozovic, I
• Format: Journal Article
• Language: English
• Published: 01-08-2010
• Subjects: COPPER OXIDE; ELECTRICAL CONDUCTIVITY; Heterostructures; INSULATORS; INTERFACES; SUPERCONDUCTIVITY; Transition temperature (superconductivity); Transport
• ISSN: 0022-3697
• DOI: 10.1016/j.jpcs.2010.03.014

Using ALL-MBE technique, we have synthesized different heterostructures consisting of an insulator La sub(2)CuO sub(4) (I) and a metal La sub(1.56)Sr sub(0.44)CuO sub(4) (M) layer neither of which is superconducting by itself. The M-I bilayers were superconducting with a critical temperature T sub(c)[asymptotic to]30-36 K. This highly robust phenomenon is confined within 1-2 nm from the interface and is primarily caused by the redistribution of doped holes across the interface. In this paper, we present a comprehensive study of the interface superconductivity by a range of experimental techniques including transport measurements of superconducting properties.