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Thermoelectric power of single-orbital and two-orbital Hubbard models on triangular lattices

✍ Scribed by Xian-Lu Gu; Feng Lu; Da-Yong Liu; Liang-Jian Zou


Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
354 KB
Volume
405
Category
Article
ISSN
0921-4526

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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 Γ€y 2 and d +