1992年2月
CHARGE FLUCTUATION AND SUPERCONDUCTIVITY IN THE D-P MODEL
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
- ,
- ,
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- 巻
- 61
- 号
- 2
- 開始ページ
- 649
- 終了ページ
- 665
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1143/JPSJ.61.649
- 出版者・発行元
- PHYSICAL SOCIETY JAPAN
We investigate effects of the repulsive interaction U(pd) between holes on the nearest-neighbor Cu- and O-sites in the d-p model with infinite repulsion on the Cu site using the auxiliary boson technique and the 1/N expansion method. It is found that the condition for a metal-insulator (M-1) transition to occur at the half-filled case is modified. We then investigate the charge susceptibility; it is found that the thermodynamic charge susceptibility is enhanced by U(pd) except for the region around the critical point of the M-1 transition. It is found to diverge at a certain value of U(pd). which implies an instability toward a phase separation. On the basis of these calculations, we obtain phase diagrams, which consist of the metallic, unstable (phase-separating) and insulating phases. Furthermore, we calculate the quasiparticle interaction and find that the charge fluctuation induces attractive interaction comparable in magnitude to the repulsive interaction originating from the on-site repulsion U(d) in both of the s- and d-wave channel; in the immediate vicinity of the instability, the attraction can overcome the repulsion.
- リンク情報
- ID情報
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- DOI : 10.1143/JPSJ.61.649
- ISSN : 0031-9015
- Web of Science ID : WOS:A1992HE26000035