Molecular field theory analysis of TbCo 3-xCu x compounds

Kervan S., Kervan N.

Journal of Superconductivity and Novel Magnetism, vol.24, no.1-2, pp.819-824, 2011 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 1-2
  • Publication Date: 2011
  • Doi Number: 10.1007/s10948-010-1025-0
  • Journal Name: Journal of Superconductivity and Novel Magnetism
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.819-824
  • Keywords: Exchange interactions, Ferrimagnetism, Molecular field theory, Rare-earth intermetallic compounds
  • Ankara Haci Bayram Veli University Affiliated: No

Abstract

The molecular field theory based on the twosublattice model was employed to analyze the temperature dependence of the magnetization and exchange interactions in TbCo 3-xCu x (0 ≤ x ≤ 0.5) compounds. The molecular field coefficients n CoCo, n TbCo and n TbTb were obtained by a numerical fitting process. The exchange coupling constants J CoCo, J TbCo and J TbTb have been calculated by using the molecular field coefficients. The Co-Co exchange energy decreases with increasing x. J CoCo dominates the three kinds of interactions, implying that the magnetic interactions are dominated by the exchange between 3d electrons. The copper substitution has little influence on the Tb-Co exchange interaction. © Springer Science+Business Media, LLC 2010.