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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/9105

Title: EXTENDED HUBBARD-MODEL IN 2 DIMENSIONS
Authors: LAAD, MS
GHOSH, DK
Keywords: intra-atomic attraction
valence bond state
thermodynamic properties
superconductivity
band
Issue Date: 1991
Publisher: IOP PUBLISHING LTD
Citation: JOURNAL OF PHYSICS-CONDENSED MATTER, 3(48), 9723-9732
Abstract: The extended Hubbard model with nearest neighbour inter-site correlations has been studied by mapping it onto a spin-Hamiltonian. In the case of a half-filled band the problem is equivalent to that of an anisotropic Heisenberg model in the absence of a field. The phases in the U-Q plane obtained here are in good agreement with those obtained by Monte Carlo simulation. The antiferromagnetic XY-ordered phase of the model is shown to be very similar to an RVB phase. Extending the analogy away from half-filling, a possible dependence of the critical temperature t(c) with the doping concentration-delta in a high-T(c) system is suggested.
URI: http://dx.doi.org/10.1088/0953-8984/3/48/014
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9105
http://hdl.handle.net/10054/9105
ISSN: 0953-8984
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