Non-unitary triplet pairing in the centrosymmetric superconductor LaNiGa${}_2$

Abstract

Muon spin rotation and relaxation experiments on the centrosymmetric intermetallic superconductor LaNiGa${}_2$ are reported. The appearance of spontaneous magnetic fields coincides with the onset of superconductivity, implying that the superconducting state breaks time reversal symmetry, similarly to non-centrosymmetric LaNiC${}_2$. Only four triplet states are compatible with this observation, all of which are non-unitary triplets. This suggests that LaNiGa${}_2$ is the centrosymmetric analogue of LaNiC${}_2$. We argue that these materials are representatives of a new family of paramagnetic non-unitary superconductors.

Accepted in Phys. Rev. Lett. arXiv admin note: substantial text overlap with arXiv:0901.3153

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