Observation of Antiferromagnetic Based Quantum Criticality in (Ce1 −X Y X )2ir3ge5 Kondo-Lattice System

Abstract

We have carried out a detailed study of the (Ce1 −x Y x )2Ir3Ge5 anti-ferromagnetic compounds across the entire range of substitution 0≤x≤0.33 and report the results of powder X-ray diffraction, magnetic susceptibility, heat capacity, and electrical resistivity measurements to exhibit the anti-ferromagnetic phase temperature (TN) versus substitution x phase diagram. The pure Ce2Ir3Ge5 system indicates anti-ferromagnetic behavior below TN = 9.5 K. Substitution of Y into (Ce1 −x Y x )2Ir3Ge5 compound leads to a decrease in the anti-ferromagnetic phase temperature (TN). Near x = 0.33, the anti-ferromagnetic transition temperature is suppressed to zero kelvin at an apparent anti-ferromagnetic quantum critical point, without the superconductivity sign, where the temperature dependence of the heat capacity and electrical resistivity in this region reveal non-Fermi Liquid behavior. The above results, for example, the suppressing of TN, maybe a new way to find low-temperature superconductivity in these compounds.

Keywords: Kondo-Lattice, Anti-ferromagnetic, non-Fermi Liquid, Quantum critical point, phase transition