Ground state of the three-band Hubbard model

Details Ground state of the three-band Hubbard model Ground state of the three-band Hubbard model

2002-08-06

arxiv.org/abs/cond-mat/0208105v1

Physical Review B64, 184509 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 17 figures

Scientific paper

10.1103/PhysRevB.64.184509

The ground state of the two-dimensional three-band Hubbard model in oxide superconductors is investigated by using the variational Monte Carlo method. The Gutzwiller-projected BCS and spin- density wave (SDW) functions are employed in the search for a possible ground state with respect to dependences on electron density. Antiferromagnetic correlations are considerably enhanced near half-filling. It is shown that the d-wave state may exist away from half-filling for both the hole and electron doping cases. The overall structure of the phase diagram obtained by the calculations qualitatively agrees with experimental indications. The superconducting condensation energy is in reasonable agreement with the experimental value obtained from specific heat and critical magnetic field measurements for optimally doped samples. The inhomogeneous SDW state is also examined near 1/8-hole doping.

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