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Group theoretical classification of broken symmetry states of the two-fold degenerate Hubbard model on a triangular lattice

โœ Scribed by Akira Masago; Naoshi Suzuki


Book ID
114223695
Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
82 KB
Volume
226-230
Category
Article
ISSN
0304-8853

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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 +