Abstract
The effect of the intersite Coulomb interaction of fermions on the ground state and energy structure of high-temperature superconductors is considered within the three-band Emery model using an extended basis of the irreducible operators orthogonal on Mori. The proposed theory allows prediction of bands of the fluctuation states whose spectral intensity grows with an increase in the root-mean-square fluctuations of the occupation numbers. The increase in these fluctuations in high-temperature superconductors upon doping plays a key role in redistribution of the integrated density of the Fermi states.
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Val’kov, V., Korovushkin, M. Energy structure of high-temperature superconductors with the intersite Coulomb interaction. Eur. Phys. J. B 69, 219–227 (2009). https://doi.org/10.1140/epjb/e2009-00141-4
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DOI: https://doi.org/10.1140/epjb/e2009-00141-4