Abstract
We report on the electronic structure, electric transport and basic thermodynamic properties of the skutterudite-related Ce3Ru4Sn13 and La3Ru4Sn13. The calculated density of electronic states within the local spin density approximation (LSDA) method well fit the X-ray photoelectron spectroscopy (XPS) valence band spectra of Ce3Ru4Sn13. Magnetic susceptibility and specific heat measurements reveal that the sixfold degenerated multiplet of Ce3+ ions splits into three doublets, due to the tetragonal Ce point local symmetry in the cubic Ce3Ru4Sn13 system. Ce3Ru4Sn13 exhibits a large increase in the specific heat, C/T, data due to Kondo effect and strong electron and short-range magnetic correlations, we also suggest significant contribution of the crystal field effect. La3Ru4Sn13 is typical BCS superconductor, however, specific heat and electrical resistivity data show that La3Ru4Sn13 also exhibits a second superconducting phase at higher temperatures, which is characteristic of inhomogeneous superconductors.
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