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Exact diagonalization study of the two-dimensional Hubbard model — superconductivity due to the two-band mechanism —

✍ Scribed by Yukihiro Shimoi; Kunihiko Yamaji

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

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✍ Kenji Kobayashi; Hisatoshi Yokoyama 📂 Article 📅 2006 🏛 Elsevier Science 🌐 English ⚖ 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 Ày 2 and d +