Superconductivity in a spin liquid: A one-dimensional example

D. G. Shelton; A. M. Tsvelik

doi:10.1103/PhysRevB.53.14036

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Superconductivity in a spin liquid: A one-dimensional example

D. G. Shelton, A. M. Tsvelik

DOI 10.1103/PhysRevB.53.14036 · Physical Review B

T1

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Abstract

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's rule coupling. We show that such a system has a divergent Cooper pair susceptibility at T=0, provided the Coulomb interaction U between electrons on the same orbital and the modulus of the Hund's exchange integral |J| are larger than the interorbital Coulomb interaction. The superconductivity can be achieved for any sign of 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 ¼ (small U) and ½ (large U). Possible experimental realizations of such systems are discussed.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
RbC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown