Phys. Rev. B 59, 3353–3356 (1999)Lattice model for the broken-time-reversal-symmetry pairing state near a surface of d-wave superconductorsReceived 13 August 1998; revised 25 September 1998; published in the issue dated 1 February 1999 Based on an extended Hubbard model, the spatial variation of the order parameter is calculated self-consistently near the surface of d-wave superconductors. It is shown a d+is order parameter can be induced near a {110} surface, leading to splitting of the zero-energy peak in the surface local density of states and the generation of a spontaneous surface supercurrent. This splitting can be diminished by the increase of orthorhombicity, on-site repulsive interaction, or temperature. Our results give a microscopic explanation for the surface broken-time-reversal-symmetry pairing state. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.59.3353
DOI:
10.1103/PhysRevB.59.3353
PACS:
74.20.-z, 74.25.Jb, 74.50.+r
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