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Singlet-triplet mixing in the order parameter of the noncentrosymmetric superconductor Ru₇B₃

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arxiv 2202.03910 v1 pith:JOEUC7H6 submitted 2022-02-08 cond-mat.supr-con

Singlet-triplet mixing in the order parameter of the noncentrosymmetric superconductor Ru₇B₃

classification cond-mat.supr-con
keywords ordereffectsinversionmixedmixingnoncentrosymmetricparametersinglet-triplet
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One of the key effects which is predicted to arise in superconductors without a centre of inversion is the mixing of singlet and triplet order parameters, which are no longer good quantum numbers on their own due to parity. We have probed the gap structure in the noncentrosymmetric superconductor Ru$_7$B$_3$, through small-angle neutron diffraction from the vortex lattice, in order to search for the proposed mixed order parameter. We find that the measured temperature dependence of the vortex-lattice form factor is well characterised by a model constructed to describe the effects of broken inversion symmetry on the superconducting state, indicating the presence of a mixed singlet-triplet gap and confirming the theoretical predictions.

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