Tuning of Magnetic Properties and Kondo Effect by Cu Concentration in Ce(Pd1-xCux)2Al3

Abstract

The electrical resistivity, magnetic susceptibility and specific heat measurements were performed on Ce(Pd 1- x Cu x ) 2 Al 3 ( x =0.0–0.7) system to investigate the effects induced by Cu substitution in the heavy fermion compound CePd 2 Al 3 . A dramatic evolution of the magnetic properties was observed with the substitution of Pd by Cu: (1) a small amount of Cu ( x < 0.1) in CePd 2 Al 3 leads to a rapid decrease of the antiferromagnetic transition temperature T N ; (2) passing through a crossover region without a long-range magnetic order, a ferromagnetic-like state, which reveals an enhanced magnetic susceptibility and a distinct peak in the specific heat curve at low temperatures, occurs around x =0.1–0.4; (3) by furthering the substitution through a second crossover region, however, the antiferromagnetic ordering is recovered close to x =0.5–0.7. A decrease tendency of the Kondo temperature T K with increasing x is derived from the analysis on the specific heat results. It is suggested that the chang...