Origin of high- Tc superconductivity in doped Hubbard models and their extensions

Roles of uniform charge fluctuations

Takahiro Misawa, Masatoshi Imada

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number115137
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number11
DOIs
Publication statusPublished - 2014 Sep 22
Externally publishedYes

Fingerprint

Hubbard model
Superconductivity
Phase separation
superconductivity
Coulomb interactions
Compressibility
Ground state
cuprates
compressibility
interactions
ground state
augmentation
Cuprate superconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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