Electronic structure of high-T c superconductors and related compounds |
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| Authors: | D D Sarma H R Krishnamurthy Seva Nimkar S Ramasesha P P Mitra T V Ramakrishnan |
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| Affiliation: | (1) Solid State and Structural Chemistry Unit, Indian Institute of Science, 560 012 Bangalore, India;(2) Department of Physics, Indian Institute of Science, 560 012 Bangalore, India |
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| Abstract: | 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 diagrambut with an additional new region characterized by strong covalency effects, which we call a covalent insulator region. We also provide a nonperturbative calculation ofJ eff, the effective in-plane antiferromagnetic interaction, as a function of parameters of the model. We suggest that the high-T c 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-T c cuprates can be given. |
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| Keywords: | Electronic structure oxide superconductors phase diagram transition metal compounds covalency |
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