Abstract
By use of the d–p model for cuprate, we investigate the density of states. One of the advantages in our method is to use the retarded propagator matrix which is defined by several composite particles, for example, pure fermion, dressed fermion with local spin fluctuation, and one with global fluctuation between nearest neighbour Cu sites. The shapes of the density of states rapidly change by doping and temperature because the propagator includes new poles and some mean fields which easily change by those external parameters. The competition between the composite states with spin fluctuation may originate from the spin gap formation observed in high-Tc cuprate.
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