Journal
PHYSICAL REVIEW B
Volume 62, Issue 14, Pages 9648-9653Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.9648
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The extended Hubbard model with nearest-neighbor (NN) Coulomb repulsion is used to study superconductivity in a static charge-density-wave (CDW) state. It is found that the doped carriers form a large Fermi surface and are condensed into the d(xy)-wave superconducting state from the root 2 x root 2 CDW state stabilized by the NN Coulomb repulsion. The superconductivity coexisting with a CDW order observed in YBa2Cu3O7-delta [S. Kramer and M. Mehring, Phys. Rev. Lett. 83, 396 (1999)] together with the superconductivity of Pr2-xCexCuO4-y [M. Brinkmann, H. Bach, and K. Westerholt, Physica C 292, 104 (1997)] may be important examples of this pairing mechanism.
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