d-wave Superconductivity in the Hubbard Model

Details d-wave Superconductivity in the Hubbard Model d-wave Superconductivity in the Hubbard Model

2000-02-23

arxiv.org/abs/cond-mat/0002352v1

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.85.1524

The superconducting instabilities of the doped repulsive 2D Hubbard model are studied in the intermediate to strong coupling regime with help of the Dynamical Cluster Approximation (DCA). To solve the effective cluster problem we employ an extended Non Crossing Approximation (NCA), which allows for a transition to the broken symmetry state. At sufficiently low temperatures we find stable d-wave solutions with off-diagonal long range order. The maximal $T_c\approx 150K$ occurs for a doping $\delta\approx 20%$ and the doping dependence of the transition temperatures agrees well with the generic high-$T_c$ phase diagram.

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