Crossover of superconducting properties and kinetic-energy gain in two-dimensional Hubbard model

Details Crossover of superconducting properties and kinetic-energy gain in two-dimensional Hubbard model Crossover of superconducting properties and kinetic-energy gain in two-dimensional Hubbard model

2003-08-14

arxiv.org/abs/cond-mat/0308264v1

J.Phys.Soc.Jpn. 73, 1119 (2004).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

10.1143/JPSJ.73.1119

Superconductivity in the Hubbard model on a square lattice near half filling is studied using an optimization (or correlated) variational Monte Carlo method. Second-order processes of the strong-coupling expansion are considered in the wave functions beyond the Gutzwiller factor. Superconductivity of d_x^2-y^2-wave is widely stable, and exhibits a crossover around U=U_co\sim 12t from a BCS type to a new type. For U\gsim U_co (U\lsim U_co), the energy gain in the superconducting state is derived from the kinetic (potential) energy. Condensation energy is large and \propto exp(-t/J) [tiny] on the strong [weak] coupling side of U_co. Cuprates belong to the strong-coupling regime.

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