Superconductivity in Na_xCoO_2yH_2O by charge fluctuation

Details Superconductivity in Na_xCoO_2yH_2O by charge fluctuation Superconductivity in Na_xCoO_2yH_2O by charge fluctuation

2003-11-12

arxiv.org/abs/cond-mat/0311266v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1143/JPSJ.73.319

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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