Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8145103 | Chinese Journal of Physics | 2018 | 11 Pages |
Abstract
The relevance of inter-site Coulomb repulsion (V) in the hole-doped cuprates is explored within tâJâV model. An exact diagonalization (ED) technique is employed to investigate some ground state and thermodynamic properties of the model for various hole-doping. Results show that electron-electron (eâe) correlation is maximum between the next-nearest-neighbor (NNN) sites which decreases sharply at distances longer than â2 times the lattice spacing. Unlike hole-concentration, Coulomb repulsion reduces effective hopping amplitude. Our results suggest that in this hole-doped system, inter-site Coulomb repulsion favors d-wave pairing. Specific heat curves show characteristic single broad peaks where the peak-height decreases with doping concentration. From specific heat and entropy curves, one can expect a superconducting state at =0.25.
Related Topics
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Authors
P. Pal, K. Roy, S. Nath, N.K. Ghosh,