Kondo behavior, ferromagnetic correlations, and crystal fields in the heavy Fermion compounds Ce3X (X=In, Sn)

Abstract

We report measurements of inelastic neutron scattering, magnetic susceptibility, magnetization, and the magnetic field dependence of the specific heat for the heavy Fermion compounds Ce${}_3$In and Ce${}_3$Sn. The neutron scattering results show that the excited crystal field levels have energies $E_1$ = 13.2 meV, $E_2$ = 44.8 meV for Ce${}_3$In and $E_1$ = 18.5 meV, $E_2$ = 36.1 meV for Ce${}_3$Sn. The Kondo temperature deduced from the quasielastic linewidth is 17 K for Ce${}_3$In and 40 K for Ce${}_3$Sn. The low temperature behavior of the specific heat, magnetization, and susceptibility can not be well-described by J=1/2 Kondo physics alone, but require calculations that include contributions from the Kondo effect, broadened crystal fields, and ferromagnetic correlations, all of which are known to be important in these compounds. We find that in Ce${}_3$In the ferromagnetic fluctuation makes a 10-15 % contribution to the ground state doublet entropy and magnetization. The large specific heat coefficient $\gamma$ in this heavy fermion system thus arises more from the ferromagnetic correlations than from the Kondo behavior.

8 pages, 6 figures

References in corpus (2)

• Spin Fluctuation in Heavy Fermion CeRu_2Si_2
• Spin Fluctuations and Non-Fermi-Liquid Behavior of CeNi_2Ge_2

Cited by in corpus (1)

• Neutron scattering and scaling behavior in URu2Zn20 and YbFe2Zn20