Europhys. Lett.
Volume 72, Number 3, November 2005
Page(s) 437 - 443
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 28 September 2005
Europhys. Lett., 72 (3), pp. 437-443 (2005)
DOI: 10.1209/epl/i2005-10242-8

Pairing state in multicomponent superconductors

V. Kuznetsova and V. Barzykin

Department of Physics and Astronomy, University of Tennessee Knoxville, TN 37996, USA

received 28 June 2005; accepted in final form 6 September 2005
published online 28 September 2005

We use the microscopic weak-coupling theory to predict the pairing state in superconductors of cubic, hexagonal, or tetragonal symmetry, where the order parameter is multicomponent, i.e., transforms according to either a 2-dimensional or a 3-dimensional representation of the crystal point group. We show that the superconducting phase usually breaks the time-reversal symmetry for singlet multicomponent superconductors. The superconducting order parameter for triplet superconductors in most cases turns out to be non-magnetic.

74.20.-z - Theories and models of superconducting state.
74.20.Rp - Pairing symmetries (other than $\mth{s}$-wave).
74.25.Dw - Superconductivity phase diagrams.

© EDP Sciences 2005