Anomalous ferromagnetism and non-Fermi-liquid behavior in the Kondo lattice CeRuSi2

TL;DR

This study investigates CeRuSi2, revealing its unique coexistence of Kondo effect and anomalous ferromagnetism, along with non-Fermi-liquid behavior at low temperatures, challenging typical ferromagnetic Kondo system expectations.

Contribution

It provides detailed experimental analysis of CeRuSi2, demonstrating its unusual coexistence of ferromagnetism and Kondo effects, and highlights non-Fermi-liquid behavior in a ferromagnetic Kondo lattice.

Findings

Coexistence of Kondo effect and anomalous ferromagnetism confirmed by measurements.

Observation of non-Fermi-liquid behavior at low temperatures.

Comparison with other magnetic Kondo lattices shows unique properties.

Abstract

The structural, electronic and magnetic properties of the Kondo-lattice system CeRuSi2 are experimentally investigated and analyzed in the series of other ternary cerium compounds. This system is shown to be an excellent model system demonstrating coexistence of the Kondo effect and anomalous ferromagnetism with a small magnetic moment which is confirmed by magnetic and \mu SR measurements. Data on specific heat, resistivity and Seebeck coefficient are presented. Being deduced from the resistivity and specific heat data, the non-Fermi-liquid behavior is observed at low temperatures, which is unusual for a ferromagnetic Kondo system. A comparison with other magnetic Kondo lattices is performed.