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The noncentrosymmetric superconductor Re$_{24}$Ti$_{5}$, a time-reversalsymmetry (TRS) breaking candidate with $T_c = 6$\,K, was studied by means ofmuon-spin rotation/relaxation ($\mu$SR) and tunnel-diode oscillator (TDO)techniques. At a macroscopic level, its bulk superconductivity was investigatedvia electrical resistivity, magnetic susceptibility, and heat capacitymeasurements. The low-temperature penetration depth, superfluid density andelectronic heat capacity all evidence an $s$-wave coupling with an enhancedsuperconducting gap. The spontaneous magnetic fields revealed by zero-field$\mu$SR below $T_c$ indicate a time-reversal symmetry breaking and thus theunconventional nature of superconductivity in Re$_{24}$Ti$_{5}$. Theconcomitant occurrence of TRS breaking also in the isostructural Re$_6$(Zr,Hf)compounds, hints at its common origin in this superconducting family and thatan enhanced spin-orbital coupling does not affect pairing symmetry.

Nodeless superconductivity and time-reversal symmetry breaking in the noncentrosymmetric superconductor Re24Ti5