Zeitschrift für Physik B Condensed Matter

ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)

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Abstract Volume 103 Issue 2 (1997) pp 153-155

Cumulant expansion for the p - d model: density of states and hole occupation

R. Citro (*), M. Marinaro

Dipartimento di Fisica Teorica e S.M.S.A., Università di Salerno, I-84081 Baronissi (Salerno), Italy

Abstract. We propose a nonstandard perturbative solution of the p - d model, based on a generalized cumulant expansion. Using a temperature dependent Green's functions formalism, the behaviour of the density of states and the hole occupation number is investigated in the charge-transfer and in the Mott-Hubbard regime, to describe realistic systems with CuO₂ sheets. A comparison with different analytic and numerical methods is also discussed.

PACS: 71.20; 71.28

(*) Present address: Dipartimento di Fisica Teorica, Università di Salerno, Via S. Allende, I-84081 Baronissi (Sa), Italy, (Fax ++39-89965275, e-mail: citro@vaxsa.csied.unisa.it)

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