CePdAl crystallizes in the hexagonal ZrNiAl-type structure (space group P6̄2m), where the magnetic Ce3+ ions form a network of equilateral triangles in the ab plane similar to the kagomé lattice. It is a well known antiferromagnetic heavy-fermion system with Néel temperature TN=2.7K. Magnetization and specific-heat measurements performed on CePd1-xNixAl polycrystals show that the antiferromagnetic order in the system is suppressed by Ni substitution. TN is reduced to zero temperature at a Ni concentration x=0.144. At high temperatures the magnetization data follow a Curie-Weiss law. The Weiss temperature |Θ| is negative with Θ increasing with x possibly due to the increasing Kondo effect. Indeed, the Kondo temperature increases with x as documented by an analysis of the specific heat and magnetic entropy of CePd1-xNixAl for the samples with x=0, 0.062, 0.097, and 0.144.
All Science Journal Classification (ASJC) codes