Decoupling between Field-instabilities of Antiferromagnetism and Pseudo-metamagnetism in Rh-doped CeRu2Si2 Kondo Lattice

TL;DR

This study investigates how Rh doping in CeRu2Si2 affects its magnetic phases, revealing decoupled behaviors between antiferromagnetic and pseudo-metamagnetic transitions under various conditions.

Contribution

It provides new insights into the decoupling of field-instabilities of antiferromagnetism and pseudo-metamagnetism in Rh-doped CeRu2Si2, highlighting the roles of lattice mismatch and magnetic modes.

Findings

Decoupling of AF and pseudo-metamagnetic transitions observed.

Distinct behaviors of magnetic phases under varying temperature, field, and pressure.

Comparison between Rh and La substitutions elucidates different magnetic fluctuation mechanisms.

Abstract

Doping Kondo lattice system CeRu2Si2 with Rh-8% (Ce(Ru0.92Rh0.08)2Si2) leads to drastic consequences due to the mismatch of the lattice parameters between CeRu2Si2 and CeRh2Si2. A large variety of experiments clarifies the unusual properties of the ground state induced by the magnetic field from longitudinal antiferromagnetic (AF) mode at H = 0 to polarized paramagnetic phase in very high magnetic field. The separation between AF phase, paramagnetic phase and polarized paramagnetic phase varying with temperature, magnetic field and pressure is discussed on the basis of the experiments down to very low temperature. Similarities and differences between Rh and La substituted alloys are discussed with emphasis on the competition between transverse and longitudinal AF modes, and ferromagnetic fluctuations.