Unconventional properties of the noncentrosymmetric superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Re</mml:mi><mml:mn>8</mml:mn></mml:msub><mml:mi>NbTa</mml:mi></mml:mrow></mml:math>
R. K. Kushwaha, Arushi, S. Sharma, Shashank Srivastava, P. K. Meena, M. Pula, J. Beare, J. Gautreau, A. D. Hillier, G. M. Luke, R. P. Singh
Abstract
Here, the authors report on the superconducting properties of the ternary noncentrosymmetric superconductor Re${}_{8}$NbTa, a new member of the Re-based superconductors that are known for the frequent occurrence of time-reversal symmetry breaking and their complex superconducting ground states. Bulk and transverse field muon spin rotation/relaxation (\ensuremath{\mu}SR) measurements confirm moderately coupled, fully gapped superconductivity. However, zero-field \ensuremath{\mu}SR measurements indicate the possible presence of spin fluctuation/time-reversal symmetry breaking in the superconducting ground state, suggesting the unconventional superconductivity in Re${}_{8}$NbTa.