### 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 (t_{3}: the three-site term). This model has no single-particle hopping and the ratio of the two terms is controlled by a parameter α≡4t_{3}/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 α_{c} = 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 language | English |
---|---|

Pages (from-to) | 1531-1535 |

Number of pages | 5 |

Journal | Journal of Physics and Chemistry of Solids |

Volume | 63 |

Issue number | 6-8 |

DOIs | |

Publication status | Published - 2002 Jan 1 |

Externally published | Yes |

### Fingerprint

### Keywords

- A. Superconductors
- D. Phase transitions
- D. Superconductivity

### ASJC Scopus subject areas

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

### Cite this

*Journal of Physics and Chemistry of Solids*,

*63*(6-8), 1531-1535. https://doi.org/10.1016/S0022-3697(02)00037-9

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

Research output: Contribution to journal › Article

*Journal of Physics and Chemistry of Solids*, vol. 63, no. 6-8, pp. 1531-1535. https://doi.org/10.1016/S0022-3697(02)00037-9

}

TY - JOUR

T1 - Competition between spin exchange and correlated hopping

AU - Saiga, Y.

AU - Imada, Masatoshi

PY - 2002/1/1

Y1 - 2002/1/1

N2 - 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.

AB - 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.

KW - A. Superconductors

KW - D. Phase transitions

KW - D. Superconductivity

UR - http://www.scopus.com/inward/record.url?scp=0036602181&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036602181&partnerID=8YFLogxK

U2 - 10.1016/S0022-3697(02)00037-9

DO - 10.1016/S0022-3697(02)00037-9

M3 - Article

AN - SCOPUS:0036602181

VL - 63

SP - 1531

EP - 1535

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

SN - 0022-3697

IS - 6-8

ER -