Comprehensive study of high-Tc 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, V.Y., Bollinger, A.T., Bozovic, N., Radovic, Z., Bozovic, I.
• Format: Journal Article
• Language: English
• Published: United States 01-08-2010
• Subjects: COPPER OXIDES; crystal structure; epitaxial growth; HIGH-TC SUPERCONDUCTORS; INTERFACES; LANTHANUM OXIDES; MATERIALS SCIENCE; oxides; STRONTIUM OXIDES; SUPERCONDUCTIVITY; SYNTHESIS; thin films; TRANSITION TEMPERATURE
• ISSN: 0022-3697; 1879-2553
• 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} {approx} 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.