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

Sampathkumaran, E. V. ; Das, I. ; Vijayaraghavan, R. ; Hirota, K. ; Ishikawa, M. (1991) Observation of heavy-fermion like behaviour and anomalous magnetism in a Pr-based metal Solid State Communications, 78 (11). pp. 971-977. ISSN 0038-1098

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/003810...

Related URL: http://dx.doi.org/10.1016/0038-1098(91)90217-J

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 Néel 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 PrCu2Si2 (~225 mJ/mol K2) 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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