We have studied the t-t′-U model by means of the composite operator method. The effect of the bare diagonal hopping term t′ that appears to be material dependent for high-Tc cuprate superconductors is analysed in detail. In particular, some local quantities are computed and a comprehensive comparison with the data by numerical simulations on finite size lattices is presented. The results show a good agreement with those obtained by Monte Carlo methods.
Local properties in the two-dimensional t-t′-U model
AVELLA, Adolfo;MANCINI, Ferdinando;
1997-01-01
Abstract
We have studied the t-t′-U model by means of the composite operator method. The effect of the bare diagonal hopping term t′ that appears to be material dependent for high-Tc cuprate superconductors is analysed in detail. In particular, some local quantities are computed and a comprehensive comparison with the data by numerical simulations on finite size lattices is presented. The results show a good agreement with those obtained by Monte Carlo methods.File in questo prodotto:
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