Skip to content

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

Hisatoshi Yokoyama, Yukio Tanaka, Masao Ogata, Hiroki Tsuchiura

cond-mat.str-elarXiv:cond-mat/0308264

Abstract

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 dx2-y2-wave is widely stable, and exhibits a crossover around U=Uco 12t from a BCS type to a new type. For U Uco (U Uco), the energy gain in the superconducting state is derived from the kinetic (potential) energy. Condensation energy is large and exp(-t/J) [tiny] on the strong [weak] coupling side of Uco. Cuprates belong to the strong-coupling regime.

Create a lesson