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Electronic structure of high-$T_c$ superconductors and related compounds

Sarma, DD and Krishnamurthy, HR and Nimkar, S and Ramasesha, S and Mitra, PP and Ramakrishnan, TV (1992) Electronic structure of high-$T_c$ superconductors and related compounds. In: Pramana, Journal of Physics, 38 (5). pp. 531-538.

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The authors study a 5-band Hubbard model for the $CuO_2$ planes in cuprate superconductors using Hartree-Fock mean-field theory including spiral spin density waves. For the half-filled case they recover a ZSA-like phase diagram but with an additional new region characterized by strong covalency effects, which they call a covalent insulator region. They also provide a nonperturbative calculation of $J_{eff}$, the effective in-plane antiferromagnetic interaction, as a function of parameters of the model. They suggest that the high-$T_c$ cuprates are in or very close to the covalent insulator region and within this they show that a consistent explanation of apparently conflicting high energy spectroscopic and magnetic measurements of the high-$T_c$ cuprates can be given.

Item Type: Journal Article
Publication: Pramana, Journal of Physics
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 29 Nov 2006
Last Modified: 21 Dec 2010 10:46
URI: http://eprints.iisc.ac.in/id/eprint/8810

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