Time Reversal Symmetry Breaking in noncentrosymmetric superconductor Re6Ti
D. Singh, K. P. Sajilesh, J. A. T. Barker, D. McK. Paul, A. D., Hillier, and R. P. Singh
TL;DR
This study reveals that Re6Ti is a noncentrosymmetric superconductor exhibiting time-reversal symmetry breaking and nodeless s-wave pairing, indicating an unconventional superconducting state intrinsic to the Re6X family.
Contribution
First demonstration of TRSB in Re6Ti using muSR, showing unconventional superconductivity unaffected by spin-orbital coupling.
Findings
Spontaneous magnetic fields indicate TRSB in Re6Ti
Superconductivity is nodeless s-wave
TRSB confirmed in Re24Ti5
Abstract
We have investigated the superconducting state of the noncentrosymmetric superconductor Re6Ti (Tc = 6.0 K) using muon-spin rotation/relaxation (muSR) technique. The zero-field muon experiment shows the presence of spontaneous magnetic fields in the superconducting state, indicating time-reversal symmetry breaking (TRSB). However, the low-temperature transverse field muon measurements suggest nodeless s-wave superconductivity. The time reversal symmetry breaking further confirmed in the stoichiometric composition Re24Ti5. These results indicate that the pairing symmetry is not affected by spin-orbital coupling Re6X family of compounds. Altogether these studies suggest unconventional nature (TRSB) of superconductivity is intrinsic to Re6X family of compounds and paves the way for further studies of this family of materials.
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