Low temperature specific heat of dense kondo ferromagnets and intermediate valence CeNi<sub>x</sub>Pt<sub>t-x</sub> compounds期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Low temperature specific heat of dense kondo ferromagnets and intermediate valence CeNi_xPt_t-x compounds

Authors:	J Ferreira da Silva and M A P P L Frey Ramos D Gignoux J C Gomez Sal

Institution:	Centro de Física da Universidade do Porto, 4000, Porto, Portugal Laboratoire Louis Néel (CNRS), 166 X, 38042, Grenoble Cedex, France D.C.I.T.T.Y.M. (Sección Ciencia de Materiales), Facultad de Ciencias, Universidad de Cantabria, 39005, Santander, Spain

Abstract:	Specific heat measurements performed in the temperature range 1.5 to 30 K in the compounds CeNi_xPt_{1 - x} with x = 0.5, 0.8 and 0.95 are presented. The analysis of the magnetic entropy enhances the results obtained previously by magnetic measurements: i) the reduction of the cerium moment due to the Kondo effect; ii) the increase of the importance of the Kondo effect in competition with the RKKY interactions when Pt is replaced by Ni. The variation of γ along the series indicates a maximum around x = 0.9 which corresponds to the magnetic instability. It is worth noting that below T_c in the ferromagnetic compounds, C_mag follows a T law, characteristic of magnon dispersion.

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