Correlation Induced Vanishing of the Gap Function on the Fermi Surface in High T_c Superconductors

1994/03/16 by G. Baskaran, Baskaran, G., D. G. Kanhere +5
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9403061

ReVTeX version 3.0, 9 pages, 5 figures as postscript files which can be obtained via anonymous ftp from imsc.ernet.in (144.16.253.1) under the directory /pub/physics. (email: [email protected])

arxiv created 1994/03/16 · arxiv updated 2009/11/30

Abstract

We present physical arguments as well as numerical evidence to show that the Cooper pair (gap) function vanishes on the Fermi surface in strongly correlated electron systems such as \tJ and \lU Hubbard models in one and two dimensions. Using exact diagonalization, we study a correlation function which is a measure of the gap function even in a finite system, and present numerical results for this correlation function on small clusters of 8 (Hubbard) and 16 (t-J) sites.

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