Observation of heavy-fermion like behaviour and anomalous magnetism in a Pr-based metal

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Abstract The results of magnetic susceptibility, electrical resistivity and heat capacity measurements on the pseudoternary solid solutions, Pr1−xGdxCu2Si2, are reported. These is an unusual enhancement of Neel temperature (TN) of Pr sub-lattice in PrCu2Si2 (TN = 21K) over that of GdCu2Si2 (TN = 13K). Present results indicate that this anomalous magnetism gets relatively depressed by positive chemical pressure effects induced by Gd or Y substitution. Interestingly, the linear coefficient of heat capacity above TN is found to be large for PrCu 2 Si 2 (∾225 mJ/mol K 2 ) and this parameter undergoes a drastic reduction with Gd substitution. Such a strong dependence of this linear term on the positive chemical pressure indicates possible heavy fermion behaviour of Pr in a metallic environment.

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