J. Phys. IV France
Volume 09, Numéro PR10, December 1999
International Workshop on Electronic Crystals
Page(s) Pr10-37 - Pr10-39
International Workshop on Electronic Crystals

J. Phys. IV France 09 (1999) Pr10-37-Pr10-39

DOI: 10.1051/jp4:19991008

Pseudogaps and charge band in the Parisi solution of insulating and superconducting electronic spin glasses at arbitrary fillings

R. Oppermann and H. Feldmann

Institut für Theoretische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

We report progress in understanding the fermionic Ising spin glass with arbitrary filling. A crossover from a magnetically disordered single band phase via two intermediate bands just below the freezing temperature to a 3-band structure at still lower temperatures - beyond an almost random field instability - is shown to emerge in the magnetic phase. An attempt is made to explain the exact solution in terms of a quantum Parisi phase. A central nonmagnetic band is found and seen to become sharply separated at T = 0 by gaps from upper and lower magnetic bands. The gap sizes tend towards zero as the number of replica symmetry breaking steps increases towards infinity. In an extended model, the competition between local pairing superconductivity and spin glass order is discussed.

© EDP Sciences 1999