Abstract
We have investigated the effect of Cd substitution on the archetypal heavy fermion antiferromagnet CeIn$_3$ via magnetic susceptibility, specific heat and resistivity measurements. The suppression of the Neel temperature, T$_{N}$, with Cd doping is more pronounced than with Sn. Nevertheless, a doping induced quantum critical point does not appear to be achievable in this system. The magnetic entropy at $T_N$ and the temperature of the maximum in resistivity are also systematically suppressed with Cd, while the effective moment and the Curie-Weiss temperature in the paramagnetic state are not affected. These results suggest that Cd locally disrupts the AFM order on its neighboring Ce moments, without affecting the valence of Ce. Moreover, the temperature dependence of the specific heat below $T_N$ is not consistent with 3D magnons in pure as well as in Cd-doped CeIn$_3$, a point that has been missed in previous investigations of CeIn$_3$ and that has bearing on the type of quantum criticality in this system.
Highlights
CeIn3 is a heavy fermion antiferromagnetAFMbelonging to the family of Ce binaries that form in the cubic Cu3Au structure
We have investigated the effect of Cd substitution on the archetypal heavy fermion antiferromagnet CeIn3 via magnetic susceptibility, specific-heat, and resistivity measurements
The temperature dependence of the specific heat below TN is not consistent with three-dimensional magnons in pure as well as in Cd-doped CeIn3, a point that has been missed in previous investigations of CeIn3 and that has bearing on the type of quantum criticality in this system
Summary
CeIn3 is a heavy fermion antiferromagnetAFMbelonging to the family of Ce binaries that form in the cubic Cu3Au structure. The magnetic entropy recovered at TN is close to RLn2, meaning that the Kondo coupling does not efficiently quench the local moments prior to magnetic ordering This is supported by a moderately large electronic specific heat coefficient in the paramagnetic state, ␥ ϳ 180 mJ/ K2 mol, corresponding to a mass enhancement of 27 compared to the nonmagnetic. The divergence of the Gruneisen ratio at this concentration has the exponent expected from a three-dimensional3D-SDW QCP.28 This is supported by the fact that there is no real breakdown of the Fermi liquidFLbehavior in the resistivity of a x = 0.25 sample when the Neel order is suppressed by a large applied magnetic field.. The paper is organized in four parts: in the first two sections we detail the crystal growth procedure and discuss the doping and magnetic field phase diagrams; we present detailed analysis of resistivity and heat-capacity measurements
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