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要旨:
We have examined the superconducting ground-state properties of the caged-type compound Sc5Rh6Sn18 using magnetization, heat capacity, and muon-spin relaxation or rotation (mu SR) measurements. Magnetization measurements indicate type-II superconductivity with an upper critical field of mu H-0(c2)(0) = 7.24 T. The zerofield-cooled and field-cooled susceptibility measurements unveil the onset of a diamagnetic signal below T-c = 4.4 K. The interpretation of the heat-capacity results below T-c using the alpha-BCS model unveils the value of alpha = 2.65, which gives thedimensionlessratio 2 Delta(0)/k(B)T(c) = 5.3, intimating that Sc5Rh6Sn18 is a strong-coupling BCS superconductor. The zero-field mu SR measurements in the longitudinal geometry exhibit a signature of the spontaneous appearance of the internal magnetic field below the superconducting transition temperature, indicating that the superconducting state is characterized by the broken time-reversal symmetry (TRS). We have compared the results of broken TRS in Sc5Rh6Sn18 with that observed in R5Rh6Sn18 (R = Lu and Y).
