Inelastic Neutron scattering in CeSi_{2-x}Ga_x ferromagnetic Kondo lattice compounds

TL;DR

This study uses inelastic neutron scattering to explore how increasing Ga concentration in CeSi_{2-x}Ga_x compounds affects Kondo and RKKY interactions, crystal field splitting, and hybridization in ferromagnetic Kondo lattices.

Contribution

It provides experimental insights into the evolution of magnetic interactions and crystal field effects with Ga doping in CeSi_{2-x}Ga_x compounds.

Findings

Kondo interactions dominate over RKKY interactions with increased Ga.

Crystal field splits the ground state in all compounds.

Calculated crystal field parameters for all studied compositions.

Abstract

Inelastic neutron scattering investigation on ferromagnetic Kondo lattice compounds belonging to CeSi_{2-x}Ga_{x}, x = 0.7, 1.0 and 1.3, system is reported. The thermal evolution of the quasielastic response shows that the Kondo interactions dominate over the RKKY interactions with increase in Ga concentration from 0.7 to 1.3. This is related to the increase in k-f hybridization with increasing Ga concentration. The high energy response indicates the ground state to be split by crystal field in all three compounds. Using the experimental results we have calculated the crystal field parameters in all three compounds studied here.