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

J. Liu, W. Xie, K. A. Gschneidner, G. J. Miller, V. K. Pecharsky

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Abstract

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, ∼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.

Original languageEnglish (US)
Article number416003
JournalJournal of Physics Condensed Matter
Volume26
Issue number41
DOIs
StatePublished - Oct 15 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • giant unit cell
  • rare earth intermetallics
  • spin glass

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