Confinement and Superconductivity at the LaAlO3/SrTiO3 Interface

Abstract

The interface between LaAlO3 and SrTiO3, two good band insulators, was found to be conducting [1], and, in some doping range, superconducting with a maximum critical temperature of about 300 mK [2,3]. I will discuss in this presentation the electronic structure, superconductivity, and the Tc versus doping phase diagram of LaAlO3/SrTiO3 and ((LaAlO3)0.5-(SrTiO3)0.5)-SrTiO3 interfaces. I will also compare superconductivity at these interfaces with superconductivity in bulk doped SrTiO3 [4]. [1] A. Ohtomo, H. Y. Hwang, Nature 427, 423 (2004). [2] N. Reyren, S. Thiel, A. D. Caviglia, L. Fitting Kourkoutis, G. Hammerl, C. Richter, C. W. Schneider, T. Kopp, A.-S. Ruetschi, D. Jaccard, M. Gabay, D. A. Muller, J.-M. Triscone and J. Mannhart, Science 317, 1196 (2007). [3] A. Caviglia, S. Gariglio, N. Reyren, D. Jaccard, T. Schneider, M. Gabay, S. Thiel, G. Hammerl, J. Mannhart, and J.-M. Triscone, Nature 456, 624 (2008). [4] S. Gariglio, M. Gabay, and J.-M. Triscone, Review APL Materials, 4, 060701 (2016).