Abstract
The superconductivity of the noncentrosymmetric compound is investigated using muon spin rotation and relaxation. Zero-field measurements reveal the presence of spontaneous static or quasistatic magnetic fields below the superconducting transition temperature —a clear indication that the superconducting state breaks time-reversal symmetry. Furthermore, transverse-field rotation measurements suggest that the superconducting gap is isotropic and that the pairing symmetry of the superconducting electrons is predominantly wave with an enhanced binding strength. The results indicate that the superconductivity in may be unconventional and paves the way for further studies of this family of materials.
- Received 14 August 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.267001
© 2015 American Physical Society