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Unconventional superconductivity in the cage-type compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="bold">Sc</mml:mi><mml:mn mathvariant="bold">5</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">Rh</mml:mi><mml:mn mathvariant="bold">6</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">Sn</mml:mi><mml:mn mathvariant="bold">18</mml:mn></mml:msub></mml:mrow></mml:math>
We have examined the superconducting ground-state properties of the caged-type compound ${\mathrm{Sc}}_{5}{\mathrm{Rh}}_{6}{\mathrm{Sn}}_{18}$ using magnetization, heat capacity, and muon-spin relaxation or rotation $(\ensuremath{\mu}\mathrm{SR})$ measurements. Magnetization measurements indicate type-II superconductivity with an upper critical field of ${\ensuremath{\mu}}_{0}{H}_{c2}(0)=7.24\phantom{\rule{0.28em}{0ex}}\mathrm{T}$. The zero-field-cooled and field-cooled susceptibility measurements unveil the onset of a diamagnetic signal below ${T}_{\mathbf{c}}=4.4\phantom{\rule{0.28em}{0ex}}\mathrm{K}$. …