Relativistic analysis of the pairing symmetry of the noncentrosymmetric superconductor LaNiC(2)

Quintanilla Jorge, Hillier Adrian D., JF Annett, Cywinski R.

Research output: Contribution to journalArticle (Academic Journal)peer-review

59 Citations (Scopus)

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.
Translated title of the contributionRelativistic analysis of the pairing symmetry of the noncentrosymmetric superconductor LaNiC(2)
Original languageEnglish
Pages (from-to)174511
Number of pages6
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume82
DOIs
Publication statusPublished - Nov 2010

Bibliographical note

Publisher: The American Physical Society

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