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

J Liu1, W Xie, K A Gschneidner

  • 1The Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, IA 50011-3020, USA. Department of Material Science and Engineering, Iowa State University, Ames, IA 50011-2300, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 24, 2014
PubMed
Summary
This summary is machine-generated.

This study reveals a cluster spin glass in Tb₁₁₇Fe₅₂Ge₁₁₃.₈(₁) at ~38 K. Competing magnetic interactions among terbium sites in the complex structure drive this spin glass behavior.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Complex materials with giant unit cells can exhibit exotic magnetic phenomena.
  • Understanding spin glass behavior is crucial for developing new magnetic materials.

Purpose of the Study:

  • To investigate the magnetic properties of the compound Tb₁₁₇Fe₅₂Ge₁₁₃.₈(₁).
  • To determine if Tb₁₁₇Fe₅₂Ge₁₁₃.₈(₁) exhibits spin glass behavior.

Main Methods:

  • AC and DC magnetic susceptibility measurements.
  • Magnetization and magnetic relaxation studies.
  • Heat capacity measurements.

Main Results:

  • Evidence for a cluster spin glass phase transition at approximately 38 K.
  • Frequency dependence of the freezing temperature fits critical slowing down and Vogel-Fulcher models.
  • Heat capacity data show no long-range magnetic order but a large Sommerfeld coefficient.

Conclusions:

  • The compound Tb₁₁₇Fe₅₂Ge₁₁₃.₈(₁) displays cluster spin glass characteristics.
  • Competing interactions between multiple non-equivalent terbium sites are responsible for the observed behavior.
  • The complex crystal structure plays a key role in the magnetic properties.