| Issue |
Europhys. Lett.
Volume 36, Number 6, November III 1996
|
|
|---|---|---|
| Page(s) | 443 - 448 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00249-7 | |
| Published online | 01 September 2002 | |
Superconductivity and spin gap in the high-doping regime of a CuO chain model
1
National High Magnetic Field Laboratory, Florida State
University, 1800 E. Paul Dirac Dr., Tallahassee, Florida 32306, USA
2
Department of Physics, Norwegian University of Science and
Technology, N-7034 Trondheim, Norway
Received:
15
July
1996
Accepted:
9
October
1996
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.
PACS: 71.27.+a – Strongly correlated electron systems / 71.30.+h – Metal-insulator transitions / 74.10.+v – Occurrence, potential candidates
© EDP Sciences, 1996
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