Magnetic ordering in TmGa

J.M. Cadogan, G.A. Stewart, S. Muños Pérez, R. Corbas, Britt Rosendahl Hansen, M. Avdeev, W.D. Hutchison

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We have determined the magnetic structure of the intermetallic compound TmGa by high-resolution neutron powder diffraction and 169Tm Mössbauer spectroscopy. This compound crystallizes in the orthorhombic (Cmcm) CrB-type structure and its magnetic structure is characterized by magnetic order of the Tm sublattice along the a-axis. The initial magnetic ordering occurs at 15(1) K and yields an
incommensurate antiferromagnetic structure described by the propagation vector k1 = [0 0.275(2) 0]. At 12 K the dominant ferromagnetic ordering of the Tm sublattice along the a-axis develops in what appears to be a first-order transition. At 3 K the magnetic structure of TmGa is predominantly ferromagnetic but a weakened incommensurate component remains. The ferromagnetic Tm moment reaches
6.7(2) μB at 3 K and the amplitude of the remaining incommensurate component is 2.7(4) μB. The 169Tm hyperfine magnetic field at 5 K is 631(1) T.

Original languageEnglish
JournalJournal of Physics: Condensed Matter
Issue number11
Publication statusPublished - 2014


  • Magnetic structure
  • Mossbauer spectroscopy
  • Rare-earth intermetallics

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