Superconductivity in a spin liquid: A one-dimensional example
- Department of Physics, University of Oxford, 1 Keble Road, Oxford, OX13NP (United Kingdom)
We study a one-dimensional model of conduction electrons with a twofold-degenerate band away from half filling interacting via the Coulomb repulsion and Hund{close_quote}s rule coupling. We show that such a system has a divergent Cooper pair susceptibility at {ital T} = 0, provided the Coulomb interaction {ital U} between electrons on the same orbital and the modulus of the Hund{close_quote}s exchange integral {parallel}{ital J}{parallel} are larger than the interorbital Coulomb interaction. The superconductivity can be achieved for {ital any} sign of {ital J}. The opening of spectral gaps makes this state stable with respect to direct electron hopping between the orbitals. The scaling dimension of the superconducting order parameter lies between 1/4 (small {ital U}) and 1/2 (large {ital U}). Possible experimental realizations of such systems are discussed. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 284375
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 21; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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