Competition between spin exchange and correlated hopping

Y. Saiga, Masatoshi Imada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The ground-state phase diagram is numerically studied for an electronic model consisting of the spin exchange term (J) and the correlated hopping term (t3: the three-site term). This model has no single-particle hopping and the ratio of the two terms is controlled by a parameter α≡4t3/J. The case of α=1 corresponds to complete suppression of single-particle hopping in the strong-coupling limit of the Hubbard model. In one dimension, phase separation takes place below a critical value αc = 0.36-0.63 which depends on the electron density. Spin gap opens in the whole region except the phase-separated one. For α ≳ 1.2 and low hole densities, charge-density-wave correlations are the most dominant, whereas singlet-pairing correlations are the most dominant in the remaining region. The possibility of superconductivity in the two-dimensional case is also discussed, based on equal-time pairing correlations.

Original languageEnglish
Pages (from-to)1531-1535
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume63
Issue number6-8
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes

Fingerprint

spin exchange
Charge density waves
Hubbard model
Superconductivity
Phase separation
Ground state
Phase diagrams
Carrier concentration
superconductivity
phase diagrams
retarding
ground state
electronics

Keywords

  • A. Superconductors
  • D. Phase transitions
  • D. Superconductivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Competition between spin exchange and correlated hopping. / Saiga, Y.; Imada, Masatoshi.

In: Journal of Physics and Chemistry of Solids, Vol. 63, No. 6-8, 01.01.2002, p. 1531-1535.

Research output: Contribution to journalArticle

Saiga, Y. ; Imada, Masatoshi. / Competition between spin exchange and correlated hopping. In: Journal of Physics and Chemistry of Solids. 2002 ; Vol. 63, No. 6-8. pp. 1531-1535.
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