Abstract
We have investigated the superconducting state of the noncentrosymmetric compound using magnetization, heat capacity, and muon-spin relaxation or rotation () measurements. has a superconducting transition temperature, . Transverse-field experiments, used to probe the superfluid density, suggest an -wave character for the superconducting gap. However, zero and longitudinal-field data reveal the presence of spontaneous static magnetic fields below indicating that time-reversal symmetry is broken in the superconducting state and an unconventional pairing mechanism. An analysis of the pairing symmetries identifies the ground states compatible with time-reversal symmetry breaking.
- Received 3 July 2013
DOI:https://doi.org/10.1103/PhysRevLett.112.107002
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Published by the American Physical Society