Two-dimensional electron superconducting gas at oxide interfaces
1 : Laboratoire de Physique et d'Étude des Matériaux, 213/CNRS - ESPCI ParisTech, 10 rue Vauquelin - 75005 Paris
(LPEM - ESPCI)
Ecole Supérieure de Physique et Chimie Industrielle
2 : Laboratoire de Physique et d'Étude des Matériaux, 213/CNRS - ESPCI ParisTech, 10 rue Vauquelin - 75005 Paris
(LPEM - ESPCI)
Ecole Supérieure de Physique et Chimie Industrielle
3 : Laboratoire de Physique et d'Étude des Matériaux, 213/CNRS - ESPCI ParisTech, 10 rue Vauquelin - 75005 Paris
(LPEM - ESPCI)
Ecole Supérieure de Physique et Chimie Industrielle
4 : Condensed Matter - Low Dimensional Systems Laboratory, Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India
(IIT)
Indian Institute of Technology
5 : Laboratoire de Physique et d'Étude des Matériaux, 213/CNRS - ESPCI ParisTech, 10 rue Vauquelin - 75005 Paris
(LPEM - ESPCI)
Ecole Supérieure de Physique et Chimie Industrielle
6 : Condensed Matter - Low Dimensional Systems Laboratory, Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India
(IIT)
Indian Institute of Technology
7 : Condensed Matter - Low Dimensional Systems Laboratory, Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India
(IIT)
Indian Institute of Technology
Transition metal oxides display a great variety of quantum electronic behavior where correlations often play an important role. The achievement of high quality epitaxial interfaces involving such materials gives a unique opportunity to engineer artificial materials where new electronic orders take place. It has been shown recently that a two-dimensional electron gas could form at the interface of two insulators such as LaAlO3 and SrTiO3 [1], or LaTiO3 (a Mott insulator) and SrTiO3 [2]. We present low temperature transport and magneto-transport measurements on LaTiO3/SrTiO3 hetero-structures, the properties of which can be modulated by the field effect using a metallic gate on the back of the substrate. The corresponding phase diagram has been investigated, and superconductivity put into evidence for the first time in this system [3]. We will discuss the role of the confinement potential and the SrTiO3 band structure on the phase diagram, and show the specific role of the spin-orbit coupling. [1] N. Reyren et al, Science 317, 1196 (2007) [2] A. Ohtomo et al, Nature 419, 378 (2002) [3] J. Biscaras, N. Bergeal et al, 1,89 Nature Communications (2010)
| Subject : | : | oral |
| Topics | : | SFP2011-6 New quantum states of Matter |
| Keywords | : | Supraconductivité interfaciale ; Oxides de métaux de transition ; perovskites ; gaz bi ; dimensionnel ; corrélations électroniques ; Couplage spin ; orbite |
| PDF version | : |  PDF version |
