Sign of canted ferromagnetism in the quasicrystal approximants Au-SM-R (SM = Si, Ge and Sn / R = Tb, Dy and Ho)

J Phys Condens Matter. 2014 May 28;26(21):216004. doi: 10.1088/0953-8984/26/21/216004. Epub 2014 May 8.

Abstract

Magnetic susceptibility and magnetization of the quasicrystal approximants Au-SM-R (SM = Si, Ge or Sn / R = Gd, Tb, Dy or Ho) are investigated. Ferromagnetic transitions are observed in all of these compounds, in contrast to the spin-glass behavior reported in similar compounds, Ag-In-R (R = Eu, Gd, Tb or Dy). Au-SM-Gd (SM = Si, Ge or Sn) exhibit a simple ferromagnetic transition at 22.5, 13 and 9 K, respectively, whereas Au-Si-(Tb, Dy or Ho) show indications of a canted ferromagnetic transition at 8.3, 5.9 and 3.8 K, respectively. The latter are attributed to a crystal electric field effect that is absent in the Gd-bearing compounds. The ferromagnetic behavior in Au-SM-R may be understood to be a consequence of the short R-R distances compared to those for Cd-R and Ag-In-R.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Crystallography, X-Ray
  • Dysprosium / chemistry
  • Germanium / chemistry
  • Gold / chemistry
  • Holmium / chemistry
  • Lanthanoid Series Elements / chemistry*
  • Magnets / chemistry*
  • Models, Chemical
  • Models, Molecular
  • Molecular Structure
  • Silicon / chemistry
  • Strontium / chemistry
  • Terbium / chemistry

Substances

  • Lanthanoid Series Elements
  • Germanium
  • Terbium
  • Dysprosium
  • Gold
  • Holmium
  • Strontium
  • Silicon