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Time-reversal symmetry breaking in the noncentrosymmetric superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Re</mml:mi><mml:mn>6</mml:mn></mml:msub><mml:mi>Ti</mml:mi></mml:math>
We have investigated the superconducting state of the noncentrosymmetric superconductor ${\mathrm{Re}}_{6}\mathrm{Ti}$ (${T}_{c}=6.0$ K) using a muon-spin rotation/relaxation 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. Similar results …