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Ferromagnetic ordering and Griffiths-like phase behavior in Gd5Ge3.9Al0.1

TitleFerromagnetic ordering and Griffiths-like phase behavior in Gd5Ge3.9Al0.1
Publication TypeJournal Article
Year of Publication2013
AuthorsZou, JD, Liu, J, Mudryk, Y, Pecharsky, VK, Gschneidner, KA
JournalJournal of Applied Physics
Date Published08
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberWOS:000323177100053
Keywordsalloys, gd-5(si1.8ge2.2), gd-5(si2ge2), gd-5(sixge1-x)(4), gd5gaxge4-x, ge, magnetic-field, rare-earth, transition

Gd5Ge3.9Al0.1 crystallizes in the Sm5Ge4-type structure at room temperature, but unlike the parent Gd5Ge4 that remains antiferromagnetic in a zero magnetic field down to at least 2K, the ground state of the Al-substituted compound is ferromagnetic. The Curie temperature of Gd5Ge3.9Al0.1 is nearly the same as that of Gd5Ge4 in a 50 kOe magnetic field. The Griffiths-like phase behavior is observed in both Gd5Ge4 and Gd5Ge3.9Al0.1 compounds. Compared with Gd5Ge4, the Neel temperature of the aluminum-substituted compound decreases by 2K, while the onset temperature of the Griffiths-like phase decreases by 5K. Substitution of Al for Ge increases the magnetocaloric effect of Gd5Ge4, and the entropy change peak shifts from 41K to 49 K. (C) 2013 AIP Publishing LLC.

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