Study of low-energy magnetic excitations in single-crystalline CeIn3 by inelastic neutron scattering

TL;DR

This study investigates low-energy magnetic excitations in single-crystalline CeIn3 using inelastic neutron scattering, revealing spin-wave behavior below the Néel temperature and persistent quasielastic and crystal-field excitations above it.

Contribution

First detailed inelastic neutron scattering analysis of CeIn3 across its magnetic transition, highlighting coexistence of spin waves and Kondo fluctuations.

Findings

Well-defined spin-wave excitations with 2 meV bandwidth below T_N

Coexistence of spin waves with quasielastic Kondo fluctuations below T_N

Persistence of quasielastic and crystal-field excitations above T_N

Abstract

Inelastic neutron scattering experiments were performed on single crystals of the heavy-fermion compound CeIn$_{3}$ for temperatures below and above the N\'eel temperature, $T_N$. In the antiferromagnetically ordered phase, well-defined spin-wave excitations with a bandwidth of 2 meV are observed. The spin waves coexist with quasielastic (QE) Kondo-type spin-fluctuations and broadened crystal-field (CF) excitations below $T_N$. Above $T_N$, only the QE and CF excitations persist, with a weak temperature dependence.