Origin of high- Tc superconductivity in doped Hubbard models and their extensions: Roles of uniform charge fluctuations

Takahiro Misawa*, Masatoshi Imada

*この研究の対応する著者

研究成果: Article査読

78 被引用数 (Scopus)

抄録

The doped Hubbard model is a simple model for high-Tc cuprate superconductors, while its ground state remains a challenge. Here, by performing state-of-the-art variational Monte Carlo calculations for the strong-coupling Hubbard model, we find evidence that the d-wave superconducting phase emerges always near the phase separation region and the superconducting order has one-to-one correspondence with the enhancement of charge compressibility. The order as well as the phase separation are vulnerable to realistic intersite Coulomb interaction, while the superexchange interaction enhances both. An appropriate combination of these two widens the stable superconducting phase.

本文言語English
論文番号115137
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
90
11
DOI
出版ステータスPublished - 2014 9月 22
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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