corner
corner
APS » Journals » Phys. Rev. B » Volume 48 » Issue 6
< Previous Article | Next Article >

Phys. Rev. B 48, 4002–4013 (1993)

Spin gap and superconductivity in the one-dimensional t-J model with Coulomb repulsion

Download: PDF (624 kB) Buy this article Export: BibTeX or EndNote (RIS)

M. Troyer
Interdisziplinäres Projektzentrum für Supercomputing, Eidgenössische Technische Hochschule, CH-8092 Zürich, Switzerland
Theoretische Physik, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland
Centro Svizzero di Calcolo Scientifico, CH-6924 Manno, Switzerland

H. Tsunetsugu
Interdisziplinäres Projektzentrum für Supercomputing, Eidgenössische Technische Hochschule, CH-8092 Zürich, Switzerland
Theoretische Physik, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland

T. M. Rice
Theoretische Physik, Eidgenössische Technische Hochschule, CH-8093 Zürich, Switzerland

J. Riera and E. Dagotto
Department of Physics, Center for Materials Research and Technology, Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306

Received 23 December 1992; published in the issue dated 1 August 1993

The one-dimensional t-J model with density-density repulsive interactions is investigated with the use of exact-diagonalization and quantum Monte Carlo methods. A short-range repulsion pushes phase separation to larger values of J/t, and leads to a widened precursor region in which a spin gap and strengthened superconducting correlations appear. The correlation exponent is calculated. On the contrary, a long-range repulsion of form 1/r suppresses superconductivity in the precursor region.

© 1993 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.48.4002
DOI:
10.1103/PhysRevB.48.4002
PACS:
74.20.Mn
 
< Previous Article | Next Article >