Abstract
We present the results of the superconducting properties of R 3 T 4 Sn 13 (R = La, Sr, and Ca; T = Co, Rh, and Ir) with quasi skutterudite structure by means of magnetic susceptibility, electrical resistivity, and specific heat measurements. It is shown that the superconductivity is of conventional s-wave type and lies in the extremely strong-coupling regime. Electron–phonon coupling constants λ ep were estimated to be almost 1 for R 3 T 4 Sn 13 , respectively. The result can be categorized as a strong-coupling superconductor; this categorization is in good agreement with the results of specific heat measurements. The λ ep and the electronic density of states at the Fermi level ( N ( E F )) increases with the superconducting transition temperature. However, superconducting transition temperature of Co-compound cannot be explained by the difference of N ( E F ). From these results, we concluded that T c of R 3 T 4 Sn 13 can be described by the strength of the λ ep .
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