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Superconductivity indications of the two-chain Hubbard model due to the two-band effect

โœ Scribed by K. Yamaji; Y. Shimoi; T. Yanagisawa


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
248 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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โœ Kenji Kobayashi; Hisatoshi Yokoyama ๐Ÿ“‚ Article ๐Ÿ“… 2006 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 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 ร€y 2 and d +