The authors employ zero-field muon spin relaxation to study time-reversal symmetry breaking (TRSB) in FeSe1−xTex. For x = 0.64 with the highest superconducting transition temperature Tc = 14.5 K, which is known to host a topological surface state and Majorana zero modes within vortices, they find a TRSB superconducting state in the bulk.
- Masaki Roppongi
- Yipeng Cai
- Takasada Shibauchi