Unidirectional d-wave superconducting domains in the two-dimensional t-J model

Details Unidirectional d-wave superconducting domains in the two-dimensional t-J model Unidirectional d-wave superconducting domains in the two-dimensional t-J model

2007-08-06

arxiv.org/abs/0708.0788v2

Phys. Rev. B 76, 140505(R) (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, minor revisions, and added references

Scientific paper

10.1103/PhysRevB.76.140505

Motivated by the recently observed pattern of unidirectional domains in high-T_c superconductors [Y. Kohsaka et al., Science 315, 1380 (2007)], we investigate the emergence of spontaneous modulations in the d-wave superconducting resonating valence bond phase using the t-J model at x=1/8 doping. Half-filled charge domains separated by four lattice spacings are found to form along one of the crystal axis leading to modulated superconductivity with out-of-phase d-wave order parameters in neighboring domains. Both renormalized mean-field theory and variational Monte Carlo calculations yield that the energies of modulated and uniform phases are very close to each other.

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