Charge-fluctuation-induced superconducting state in two-dimensional quarter-filled electron systems

Akito Kobayashi*, Yasuhiro Tanaka, Masao Ogata, Yoshikazu Suzumura

*この研究の対応する著者

研究成果: Article査読

47 被引用数 (Scopus)

抄録

We investigate superconducting (SC) states in a two-dimensional extended Hubbard model at quarter-filling with on-site repulsive interaction (U) and nearest-neighbor repulsive interaction (V), which lead to spin fluctuation and charge fluctuation, respectively. The effect of charge fluctuation on the onset of the SC state is estimated by calculating pairing interaction within the random phase approximation. Solving a linearized Eliashberg equation with an anomalous self-energy as a function of both momentum and frequency, we examine the stability of a singlet SC state in a phase diagram of U and V with fixed temperatures. We obtain a novel result that the obtained SC state has d xy symmetry in the vicinity of both spin density wave (SDW) phase (U ≳ V) and charge density wave (CDW) phase (V ≳ U). The CDW-SC and SC-metal phase boundaries exhibit reentrant structures on the V-T (temperature) plane.

本文言語English
ページ(範囲)1115-1118
ページ数4
ジャーナルjournal of the physical society of japan
73
5
DOI
出版ステータスPublished - 2004 5月
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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