Observation of broken time-reversal symmetry in the heavy-fermion superconductor UPt <sub>3</sub>
Observation of broken time-reversal symmetry in the heavy-fermion superconductor UPt <sub>3</sub>
The symmetry properties of the order parameter characterize different phases of unconventional superconductors. In the case of the heavy-fermion superconductor UPt$_3$, a key question is whether its multiple superconducting phases preserve or break time-reversal symmetry (TRS). We tested for asymmetry in the phase shift between left and right circularly polarized …