Comparison of effective models for CuO2 layers in oxide superconductors
A. Ramak, P. Prelovek
DOI 10.1103/PhysRevB.40.2239 · Physical Review B
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Abstract
Several effective models, as derived from a general two-band Hubbard model for CuO2 layers in oxide superconductors, are studied. In particular, we compare the Hubbard model with the hole-spin models (unsymmetrized and symmetrized) and a generalized effective single-band (t-J) model. The exact calculation of energy spectra on a chain of four cells shows that states for a single additional hole are quite well reproduced by reduced models, taking into account the renormalization of constants. Less satisfactory is the agreement for the undoped system, especially for small charge-transfer energies. The same analytical procedure is applied to the square lattice system, where the parameters are estimated also from the levels of a single CuO4 group. The results for quasiparticle spectra indicate that corrections to the t-J model are even smaller than in the case of the single-band Hubbard model.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Y2BaCu3O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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