Unconventional superconductivity in the cage type compound Sc${}_5$Rh${}_6$Sn${}_{18}$

Abstract

We have examined the superconducting ground state properties of the caged type compound Sc${}_5$Rh${}_6$Sn${}_{18}$ using magnetization, heat capacity, and muon-spin relaxation or rotation ($\mu$SR) measurements. Magnetization measurements indicate type-II superconductivity with an upper critical field ${\mu }_0{H}_{c2}(0)$ = 7.24 T. The zero-field cooled and field cooled susceptibility measurements unveil an onset of diamagnetic signal below $T_{\mathbf{c}}$ = 4.4 K. The interpretation of the heat capacity results below $T_{\mathbf{c}}$ using the $\alpha -$BCS model unveils the value of $\alpha$ = 2.65, which gives the dimensionless ratio 2$\Delta (0)/k_B{T}_{\mathbf{c}}$ = 5.3, intimating that Sc${}_5$Rh${}_6$Sn${}_{18}$ is a strong-coupling BCS superconductor. The zero-field $\mu$SR measurements in the longitudinal geometry exhibit a signature of a 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 Sc${}_5$Rh${}_6$Sn${}_{18}$ with that observed in R${}_5$Rh${}_6$Sn${}_{18}$ (R = Lu and Y).

arXiv comment6 pages, 4 figures. arXiv admin note: text overlap with arXiv:1411.6877

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