Abstract

The crystal structures and the physical (magnetic, electricaltransport and thermodynamic) properties of the ternary compoundsCeRhSi2 andCe2Rh3Si5 (orthorhombicCeNiSi2- andU2Co3Si5-type structures, respectively) were studied over wide ranges of temperature and magnetic fieldstrength. The results revealed that both materials are valence fluctuating systems, in line withprevious literature reports. Direct evidence for valence fluctuations was obtained by means of CeLIII-edge x-ray absorption spectroscopy and Ce 3d core-level x-ray photoelectron spectroscopy.The experimental data were confronted with the results of ab initio calculations of theelectronic band structures in both compounds.

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