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Broken time-reversal symmetry in the cubic skutterudite-like superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ru</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ge</mml:mi><mml:mn>13</mml:mn></mml:msub></mml:math>
The microscopic properties of the superconducting cubic skutterudite-like material ${\mathrm{Y}}_{3}{\mathrm{Ru}}_{4}{\mathrm{Ge}}_{13}$ are investigated using muon spin relaxation and rotation ($\ensuremath{\mu}\mathrm{SR}$) measurements. Zero-field $\ensuremath{\mu}\mathrm{SR}$ measurements reveal the presence of a spontaneous internal field with a magnitude of $\ensuremath{\simeq}0.18$ mT below the superconducting transition temperature, indicating broken time-reversal symmetry in the ground state. …