Stability of the superconducting state i
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Kenji Kobayashi; Hisatoshi Yokoyama
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Article
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2006
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Elsevier Science
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English
β 194 KB
As a model of the novel superconductor Na x CoO 2 AE yH 2 O, we study a triangular Hubbard model with doubly degenerate atomic orbitals, using an optimization variational Monte Carlo method. It is found that when the isolated Fermi surface overlaps the van Hove singularity points, d x 2 Γy 2 and d +