Abstract
Zero-field muon spin rotation and relaxation $(\ensuremath{\mu}\mathrm{SR})$ studies carried out on the strongly coupled, noncentrosymmetric superconductor ${\mathrm{Mo}}_{3}{\mathrm{Al}}_{2}\mathrm{C},{T}_{c}=9$ K, did not reveal hints of time-reversal symmetry breaking as was found for a number of other noncentrosymmetric systems. Transverse field measurements performed above and below the superconducting transition temperature defined the temperature dependent London penetration depth, which in turn served to derive from a microscopic point of view a simple $s$-wave superconducting state in ${\mathrm{Mo}}_{3}{\mathrm{Al}}_{2}\mathrm{C}$. The present investigations also provide fairly solid grounds to conclude that time-reversal symmetry breaking is not an immanent feature of noncentrosymmetric superconductors.
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