Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Superconductivity: (General) Theory
TT 50.4: Vortrag
Freitag, 30. März 2012, 10:15–10:30, H 3010
Phase Diagram of Electron Systems near the Superconductor-Insulator Transition — •Thomas Nattermann1, Valery Pokrovsky2,3, and Gianmaria Falco1 — 1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany — 2Department of Physics, Texas A&M University, College Station, Texas 77843-424 — 3Landau Institute for Theoretical Physics, Chernogolovka, Moscow District, 142432, Russia
The zero temperature phase diagram of Cooper pairs exposed to disorder and magnetic field is determined theoretically from a variational approach. Four distinct phases are found: a Bose and a Fermi insulating, a metallic and a superconducting phase, respectively. The results explain the giant negative magneto-resistance found experimentally in In-O, TiN, Bi and high-Tc materials.