Relativistic analysis of the pairing symmetry of the noncentrosymmetric superconductor LaNiC2

Quintanilla, Jorge and Hillier, Adrian D and Annett, James F and Cywinski, Robert (2010) Relativistic analysis of the pairing symmetry of the noncentrosymmetric superconductor LaNiC2. Physical Review B: Condensed Matter and Materials Physics, 82 (17). p. 174511. ISSN 0163-1829. (Full text available)

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http://dx.doi.org/10.1103/PhysRevB.82.174511

Abstract

We present a relativistic symmetry analysis of the allowed pairing states in the noncentroymmetric superconductor LaNiC2. The case of zero spin-orbit coupling (SOC) is discussed first and then the evolution of the symmetry-allowed superconducting instabilities as SOC is adiabatically turned on is described. In addition to mixing singlet with triplet pairing, SOC splits some triplet pairing states with degenerate order-parameter spaces into nondegenerate pairing states with different critical temperatures. We address the breaking of time-reversal symmetry detected in recent muon spin-relaxation experiments and show that it is only compatible with such nonunitary triplet pairing states. In particular, an alternative scenario featuring conventional singlet pairing with a small admixture of triplet pairing is shown to be incompatible with the experimental data.

Item Type: Article
Subjects: Q Science
Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Jorge Quintanilla
Date Deposited: 17 Nov 2010 11:37
Last Modified: 30 Jun 2014 14:11
Resource URI: http://kar.kent.ac.uk/id/eprint/26055 (The current URI for this page, for reference purposes)
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