J. Phys. I France
Volume 3, Numéro 4, April 1993
Page(s) 1043 - 1051
DOI: 10.1051/jp1:1993109
J. Phys. I France 3 (1993) 1043-1051

Double layer Hubbard model : off-diagonal long range order in the nodeless d-wave channel

I. Morgenstern, Th. Husslein, J. M. Singer and H.-G. Matuttis

Department of Physics, University of Regensburg, D-8400 Regensburg, Germany and HLRZ, c/o KFA Jülich, Postfach 1913, D-5170 Jülich, Germany

We report on a numerical study of the double layer Hubbard model describing the CuO 2 sheets in the high- $T_{\rm c}$ oxides. For the simulation we employed the projector quantum Monte Carlo method (PQMC) to study the ground state properties of this correlated electron system. Our results provide evidence for off-diagonal long range order in the nodeless d-wave channel. The implications with respect to possible mechanisms for high- $T_{\rm c}$ superconductivity in oxides in combination which phononic booster mechanisms are discussed.


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