Magnetic ordering, Kondo effect and superconductivity in Ce2-x(La, Y)xRhSi3

TL;DR

This study explores how chemical pressure via La and Y substitutions affects magnetic, Kondo, and superconducting properties of Ce2RhSi3, revealing differences in Kondo behavior and superconductivity at low temperatures.

Contribution

It provides new insights into the effects of chemical substitution on magnetic and electronic properties of Ce-based compounds, highlighting the role of Y in enhancing the Kondo temperature.

Findings

Y enhances the Kondo temperature more effectively than La.

La2RhSi3 becomes superconducting below 3 K.

Both substitutions show features of Kondo-lattice to single-ion Kondo transition.

Abstract

The influence of positive and negative chemical pressure on the magnetic behavior of the compound, Ce2RhSi3, crystallizing in a AlB2-derived hexagonal structure and ordering antiferromagnetically around (TN = 7 K), is investigated by studying electrical resistivity (rho) and magnetic susceptibility (chi) behavior of the solid solutions formed by gradual substitution of La/ Y for Ce. While typical features associated with a transformation from the Kondo-lattice to single-ion Kondo effect are seen in the low temperature rho data of both the solid solutions, there are profound differences in their behavior at higher temperatures. In particular, Y is apparently more effective in enhancing the Kondo temperature. La2RhSi3 is found to be superconducting below 3 K.