Hydrogenation of the ternary compounds CeNiX (X = Al, Ga, In, Si, Ge and Sn): influence on the valence state of cerium

B. Chevalier, M. Pasturel, J. L. Bobet, R. Decourt, J. Etourneau, O. Isnard, J. S. Marcos, JR Fernandez

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The hydrogenation process of the intermediate valence compounds CeNiAl, CeNiGa, CeNiIn, CeNiSi and CeNiGe and of the Kondo semiconductor stannide CeNiSn has been investigated. Magnetization and electrical resistivity measurements reveal interesting physical transition induced by the insertion of hydrogen: (i) the Kondo temperature decreases from 600(20) to 220(10) K in the sequence CeNiGe → CeNiGeH1.6(1); (ii) the hydrides CeNiAlH1.93(5) and CeNiGaH1.1(1) contain cerium in trivalent state and the former shows the presence of magnetic correlations around 3.6(2) K; (iii) in contrast, CeNiInH1.8(2) presents a ferromagnetic transition at TC=6.8(2) K and a magnetic transition Kondo semiconductor → antiferromagnet (TN=4.5(2) K) → ferromagnet (TC=7.0(2) K) is evidenced in the CeNiSnHY system. These results are explained by a modification of the competition between RKKY magnetic interaction and Kondo interaction induced by the hydrogenation of these intermetallics.
Original languageEnglish
Pages (from-to)4-9
Number of pages6
JournalJournal of Alloys and Compounds
Volume383
Issue number1/2
Early online date2 Jun 2004
DOIs
Publication statusPublished - 30 Nov 2004

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