Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 5, Pages 1119-1122Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.1119
Keywords
superconductivity; condensation energy; kinetic energy; crossover; high-T-c cuprate; Hubbard model; variational Monte Carlo method; optical conductivity; antiferromagnetism
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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 a strong-coupling expansion are considered in wave functions beyond the Gutzwiller projection. Superconductivity of d(x2-y2)-wave symmetry is widely stable, and exhibits a crossover around U = U-co similar to 12t from a BCS type to a new type. For U greater than or similar to U-co (U less than or similar to U-co), the energy gain in the superconducting state is derived from the kinetic (potential) energy. Condensation energy is large and alpha exp(-t/J) [tiny] on the strong [weak] coupling side of U-co. With reference to experiments on optical conductivity, cuprates belong to the strong-coupling regime.
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