Magnetization studies of RMn6Ge6-xGax single crystals (R=Sc, Y, Gd-Lu; 0.63≤x≤1.00)

L. Zhang, J. C.P. Klaasse, E. Brück, K. H.J. Buschow, F. R. De Boer, S. Yoshii, K. Kindo, C. Lefèvre, G. Venturini

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10 Citations (Scopus)


The magnetic properties of single crystals of rare-earth compounds of composition RMn6Ge6-xGax (x ≈ 1) have been studied. In these compounds, the Mn sublattice orders ferromagnetically with a preferred moment direction perpendicular to the c axis. In the compounds in which also the R component carries a magnetic moment, the latter couple antiparallel to the Mn moments. Upon cooling from room temperature to cryogenic temperatures, the R-sublattice anisotropy becomes the dominant contribution to the total magnetocrystalline anisotropy, which leads to a spin-reorientation transition at intermediate temperatures for R=Tb-Yb. At low temperatures, the preferred moment directions are characterized by an easy axis for R=Tb, Er, Tm, and Yb and by an easy cone for R=Dy and Ho. A satisfactory account of the observed preferred moment directions has been given in terms of crystal-field theory. Measurements of the magnetization in the main crystallographic directions have been made in high magnetic fields, up to about 55 T. The interplay between the antiferromagnetic intersublattice R-Mn coupling and the magnetocrystalline anisotropy leads to field-induced magnetic phase transitions which are particularly pronounced in the compounds with Ho, Er and Tm.

Original languageEnglish
Article number224425
Pages (from-to)224425-1-224425-9
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
Publication statusPublished - 2004 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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