Abstract
Measurements of electrical resistivity and specific heat on single crystals of YbTr2Al20 (Tr = Mo and Ta) revealed that both compounds exhibit a type-II superconducting state with a transition temperature Tc = 1.60 K and 0.95 K, respectively. The superconducting properties of both compounds are consistent with the weak-coupling BCS nature. Temperature dependence of the specific heat divided by temperature for both compounds deviates upwards from a T2-dependence above T∼ 6 K suggesting the existence of large optical phonon contributions from the vibration of the guest ions. We discuss the relation between the emergence of the superconductivity and the vibrations using the parameter dGFD represents the guest free distance of the cage-center ions.
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