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Magnetic ordering in the HfFe6Ge6-type TbFe6Sn4Ge2compound

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
436
Identifiers
DOI: 10.1016/j.jallcom.2006.06.099
Keywords
  • Terbium
  • Iron
  • Tin
  • Germanium
  • Antiferromagnetic
  • Helimagnetic Order
  • [Formula Omitted]Mössbauer
  • Neutron Scattering
Disciplines
  • Physics

Abstract

Abstract We have determined the magnetic structures of the Tb and Fe sublattices in TbFe 6 Sn 4 Ge 2 by combining powder neutron diffraction with Fe 57 and Sn 119 Mössbauer spectroscopy. TbFe 6 Sn 4 Ge 2 adopts the hexagonal HfFe 6 Ge 6-type ( P 6 / m m m ) crystal structure. The Fe sublattice orders antiferromagnetically below T N = 518 ( 3 )  K, with the moments parallel to c. At T t = 42 ( 1 )  K, the Tb sublattice orders helimagnetically, with a propagation vector Q = ( 0 , 0 , 0.0963 ) r.l.u. (at 2 K). This imposes helimagnetic order (with an identical propagation vector) on the Fe sublattice, indicating that the two sublattices are coupled for T < T t . The canting angle of the Fe moments from the c-axis in the helimagnetic structure is 10(1) ° .

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