Physics – Condensed Matter – Superconductivity
Scientific paper
2003-10-24
Physics
Condensed Matter
Superconductivity
9 pages, 5 figures, submitted to Journal of the Phys. Soc. of Japan
Scientific paper
10.1143/JPSJ.73.1115
We investigate the superconducting (SC) state in two-dimensional extended Hubbard model at a quarter-filling with the on-site repulsive interaction ($U$) and the nearest-neighbor one ($V$), which lead to the spin fluctuation and the charge fluctuation, respectively. The effect of the charge fluctuation on the onset of the SC state is calculated by estimating the pairing interaction within the random phase approximation. Solving the linearized Eliashberg equation with the anomalous self-energy as the function of both momentum and frequency, we examined the singlet SC state on the plane of $U$ and $V$ with the fixed temperature. We found a novel result that the SC state with the $d_{xy}$ symmetry retains for most parameters of $U$ and $V$, although the pairing interaction changes the sign from repulsive one into attractive one with increasing $V$. The reentrant transition as the function of temperature occurs close to the onset of the SC state.
Kobayashi Akito
Ogata Masao
Suzumura Yoshikazu
Tanaka Yasuhiro
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