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Magnetic structures of Zr6CoAs2-type Ho6FeSb2, Ho6CoBi2, Ho6FeBi2and Ho6MnBi2compounds

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
395
Identifiers
DOI: 10.1016/j.jallcom.2004.11.022
Keywords
  • Rare Earth Compounds
  • Magnetic Structure
Disciplines
  • Physics

Abstract

Abstract Investigations were made by neutron diffraction on Zr 6CoAs 2-type (space group P6 b2 m No 189) Ho 6FeSb 2, Ho 6CoBi 2, Ho 6FeBi 2 and Ho 6MnBi 2 compounds. The Ho 6FeSb 2, Ho 6CoBi 2, Ho 6FeBi 2 and Ho 6MnBi 2 compounds show seven magnetic ordering types: collinear ferromagnetic FC1 and FC2 type, and non-collinear ferromagnetic FNC1–FNC5 types. The Ho 6FeSb 2 compound has magnetic transitions at 52(4) K (FC1), 40(4) K (FC2) and 32(4) K (FNC4). Below 67(4) K the Ho 6CoBi 2 compound has a ferromagnetic collinear type of ordering (FC1) with the magnetic moments of the Ho atoms along the c-axis. Below 22(4) K the Ho 6CoBi 2 compound has an incommensurate magnetic structure (FNC1). The propagation vector is k = [0, 0, 1986(6)], the magnetic moments of the Ho atoms ( μ Ho = 7.5(8) μ B) form a cone with an angle β = 20(3)° at 2 K (the cone axis coincides with c-axis). The Ho 6FeBi 2 compound has magnetic transitions at 48(4) K (FC1), 15(4) K (FNC2) and 9(4) K (FNC3). The Ho 6MnBi 2 compound displays magnetic transitions at 200(10) K (FC1), 78(4) K (FC2) and 58(4) K (FNC5). In these compounds, no local moment was detected on the transition metal site. A full description of the magnetic ordering types FC1, FC2, FNC1-FNC5 is given. Both, the type of transition metal and the distortion of the unit cell strongly influence the ordering temperature and the magnetic structure in these compounds.

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