Electronic structure of high-Tc superconductors and related compounds

Sarma, D. D., Krishnamurthy, H. R., Nimkar, S., Ramasesha, S., Mitra, P. P., Ramakrishnan, T. V. (1992) Electronic structure of high-Tc superconductors and related compounds. Pramana, 38 (5). L531-L538. ISSN 03044289 (ISSN)

URL: http://link.springer.com/article/10.1007/BF0284749...
DOI: 10.1007/bf02847492


We study a 5-band Hubbard model for the CuO2 planes in cuprate super-conductors using Hartree-Fock mean-field theory including spiral spin density waves. For the half-filled case we recover a ZSA-like phase diagram but with an additional new region characterized by strong covalency effects, which we call a covalent insulator region. We also provide a nonperturbative calculation of Jeff, the effective in-plane antiferromagnetic interaction, as a function of parameters of the model. We suggest that the high-Tc cuprates are in or very close to the covalent insulator region and within this we show that a consistent explanation of apparently conflicting high energy spectroscopic and magnetic measurements of the high-Tc cuprates can be given. © 1992 Indian Academy of Sciences.

Item Type: Paper
Uncontrolled Keywords: 71.10 71.30 74.70 75.10 covalency Electronic structure oxide superconductors phase diagram transition metal compounds
Subjects: physics
CSHL Authors:
Communities: CSHL labs > Mitra lab
Depositing User: CSHL Librarian
Date: 1992
Date Deposited: 02 Apr 2012 20:13
Last Modified: 10 Feb 2017 20:50
URI: https://repository.cshl.edu/id/eprint/25874

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