EPL

Issue		Europhys. Lett. Volume 36, Number 6, November 1996
Page(s)		443 - 448
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		10.1209/epl/i1996-00249-7

Superconductivity and spin gap in the high-doping regime of a CuO chain model DOI: 10.1209/epl/i1996-00249-7

Europhys. Lett, 36 (6), pp. 443-448 (1996)

Superconductivity and spin gap in the high-doping regime of a CuO chain model

A. W. Sandvik and A. Sudbø

National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Dr., Tallahassee, Florida 32306, USA
Department of Physics, Norwegian University of Science and Technology, N-7034 Trondheim, Norway

(received 15 July 1996; accepted 9 October 1996)

PACS. 71.27 - Strongly correlated electron systems.
PACS. 71.30 - Metal-insulator transitions.
PACS. 74.10 - Occurrence, potential candidates.

Abstract:

A two-band Hubbard model describing a CuO chain is studied using quantum Monte Carlo simulation. The Luttinger-liquid exponent

is extracted as a function of the nearest-neighbor repulsion V, at hole fillings

between 1 (half-filled lower band) and 2. Evidence is presented for the existence of a regime with dominant singlet superconducting fluctuations and a gap in the spin excitation spectrum at

, in the neighborhood of the V for which the system phase separates. Closer to half-filling (

), spin-density-wave fluctuations always dominate.

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