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Magnetic instability and crystalline field anisotropy in the space group P6̄2m with application to Fe2P

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
49
Issue
7
Identifiers
DOI: 10.1016/0022-3697(88)90035-2
Keywords
  • Magnetic Structure
  • Magnetic Anisotropy
  • Metamagnetism
  • Ferro-Antiferromagnetic Transitions
  • Crystal Field Interaction
  • Spin Hamiltonians
Disciplines
  • Physics

Abstract

Abstract The space group P6̄2 m has four different magnetic single modes: one ferro- and one antiferromagnetic mode ( S = Sc) and two types of triangular antiferromagnetic spin configurations. Coexistence of a ferromagnetic mode and a triangular mode is not possible for symmetry reasons. If, however, the C 2 v symmetry of the crystalline field potential decreases to σ v , or lower, a mixing can be energetically favorable. This means that the metamagnetic behavior of e.g. non-stoichiometric Fe 2P can be described in terms of a symmetry breaking perturbation. Expressions for the exchange energies of the different modes in a localized spin model, including anisotropy, are presented.

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