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Multigap superconductivity in the filled-skutterudite compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">LaRu</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">As</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:math> probed by muon spin rotation
Muon spin rotation ($\ensuremath{\mu}\mathrm{SR}$) and inelastic x-ray scattering were used to investigate the superconducting properties of the filled-skutterudite compound ${\mathrm{LaRu}}_{4}{\mathrm{As}}_{12}$. A two-gap isotropic ($s+s$)-wave model can explain the temperature dependence of the superfluid density. Zero-field $\ensuremath{\mu}\mathrm{SR}$ measurements confirm that the time-reversal symmetry does not break upon entering the superconducting state. …