We investigate the effects of disorder in the single-band t-J model, mainly devoting our analysis to the superconducting phases with d-wave or s-wave symmetry. We present evidence that, in the presence of strong correlation with reduced bandwidth and Van Hove singularity in the density of states, a self-consistent approach for the self-energy associated to the impurities is required. Numerical estimates of the reduction of the critical temperature with disorder are given. When a constant imaginary part of the self-energy is taken, avoiding self-consistency, the reduction of the critical temperature is overestimated. © 1995 The American Physical Society.

DISORDER EFFECTS IN THE T-J MODEL / Caprara, Sergio; S., De Palo; Castellani, Claudio; DI CASTRO, Carlo; Grilli, Marco. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 51:17(1995), pp. 11996-11999. [10.1103/physrevb.51.11996]

DISORDER EFFECTS IN THE T-J MODEL

CAPRARA, SERGIO;CASTELLANI, Claudio;DI CASTRO, Carlo;GRILLI, Marco
1995

Abstract

We investigate the effects of disorder in the single-band t-J model, mainly devoting our analysis to the superconducting phases with d-wave or s-wave symmetry. We present evidence that, in the presence of strong correlation with reduced bandwidth and Van Hove singularity in the density of states, a self-consistent approach for the self-energy associated to the impurities is required. Numerical estimates of the reduction of the critical temperature with disorder are given. When a constant imaginary part of the self-energy is taken, avoiding self-consistency, the reduction of the critical temperature is overestimated. © 1995 The American Physical Society.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/243356
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