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).
