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Non-unitary triplet pairing in the centrosymmetric superconductor LaNiGa₂

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arxiv 1206.5905 v1 pith:JCLCTDSX submitted 2012-06-26 cond-mat.supr-con cond-mat.str-el

Non-unitary triplet pairing in the centrosymmetric superconductor LaNiGa₂

A. D. Hillier , J. Quintanilla , B. Mazidian , J. F. Annett , R. Cywinski This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords centrosymmetriclaniganon-unitarylanicsuperconductortripletanalogueappearance
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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