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Broken time-reversal symmetry in a new non-centrosymmetric superconductor Re8NbTa

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arxiv 2401.07614 v1 pith:CZG2TCJL submitted 2024-01-15 cond-mat.supr-con

Broken time-reversal symmetry in a new non-centrosymmetric superconductor Re8NbTa

classification cond-mat.supr-con
keywords measurementssuperconductingfieldheatspecificsuperconductivitysuperconductorsymmetry
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Re-based superconductors provide a rich platform for the study of unconventional superconductivity. We have investigated the superconducting properties of Re$_{8}$NbTa, a new noncentrosymmetric cubic ($\alpha$-Mn structure) rhenium-based ternary superconductor using transport, magnetization, specific heat, and muon spin rotation/relaxation ($\mu$SR) measurements. Specific heat and transverse field $\mu$SR measurements suggest moderately coupled fully gapped superconductivity, well described by BCS theory. However, our zero-field $\mu$SR measurements reveal a small internal field onsetting around the superconducting T$_c$, indicating that the superconducting order parameter breaks the time-reversal symmetry.

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