Enhanced magnetic entropy in Gd Ni2

N. V. Baranov, A. V. Proshkin, E. G. Gerasimov, A. Podlesnyak, J. Mesot

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Abstract

Measurements of the specific heat have been performed on Gd1-x Yx Ni2 (x=0,0.2) compounds and their nonmagnetic analogs Lu1-y Yy Ni2, which have similar molar masses. It is found that the difference between the entropies of magnetic and nonmagnetic compounds with identical molar masses surpasses substantially (by 14-19%) the theoretical limit for the magnetic contribution Sm = (1-x) R ln (8) calculated assuming that only Gd ions possess a magnetic moment. This observed enhancement of the magnetic entropy in Gd1-x Yx Ni2 is believed to result from spin fluctuations induced by f-d exchange in the 3d electron subsystem of Ni.

Original languageEnglish
Article number092402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number9
DOIs
StatePublished - Mar 12 2007
Externally publishedYes

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