Superconductivity in NaxCoO2yH2O by charge fluctuation
Yasuhiro Tanaka, Youichi Yanase, Masao Ogata
Abstract
A new mechanism for superconductivity in the newly discovered Co-based oxide is proposed by using charge fluctuation. A single-band extended Hubbard model on the triangular lattice is studied within random phase approximation. f-wave triplet superconductivity is stabilized in the vicinity of charge-density-wave instability, which is in sharp contrast with the square-lattice case. The physical origin of the realization of the f-wave triplet state as well as the relevance to experiments are discussed.
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