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Spin-glass behavior in a giant unit cell compound Tb117Fe52Ge113.8(1)

TitleSpin-glass behavior in a giant unit cell compound Tb117Fe52Ge113.8(1)
Publication TypeJournal Article
Year of Publication2014
AuthorsLiu, J, Xie, W, Gschneidner, KA, Miller, GJ, Pecharsky, VK
JournalJournal of Physics-Condensed Matter
Date Published10
Type of ArticleArticle
ISBN Number0953-8984
Accession NumberWOS:000343423600008
Keywordsfulcher, giant unit cell, law, Rare earth intermetallics, Spin glass, temperature, transition

In this paper we demonstrate evidence of a cluster spin glass in Tb117Fe52Ge113.8(1) (a compound with a giant cubic unit cell) via ac and dc magnetic susceptibility, magnetization, magnetic relaxation and heat capacity measurements. The results clearly show that Tb117Fe52Ge113.8(1) undergoes a spin glass phase transition at the freezing temperature, similar to 38 K. The good fit of the frequency dependence of the freezing temperature to the critical slowing down model and Vogel-Fulcher law strongly suggest the formation of cluster glass in the Tb117Fe52Ge113.8(1) system. The heat capacity data exhibit no evidence for long-range magnetic order, and yield a large value of Sommerfeld coefficient. The spin glass behavior of Tb117Fe52Ge113.8(1) may be understood by assuming the presence of competing interactions among multiple non-equivalent Tb sites present in the highly complex unit cell.

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