Spin-waves in antiferromagnetic single-crystal LiFeP O4

Jiying Li, Vasile O. Garlea, Jerel L. Zarestky, David Vaknin

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60 Scopus citations

Abstract

Spin-wave dispersions in the antiferromagnetic state of single-crystal LiFeP O4 were determined by inelastic neutron scattering measurements. The dispersion curves measured from the (0,1,0) reflection along both a* and b* reciprocal-space directions reflect the anisotropic coupling of the layered Fe2+ (S=2) spin system. The spin-wave dispersion curves were theoretically modeled using linear spin-wave theory by including in the spin Hamiltonian in-plane nearest- and next-nearest-neighbor interactions (J1 and J2), inter-plane nearest-neighbor interactions (J) and a single-ion anisotropy (D). A weak (0,1,0) magnetic peak was observed in elastic neutron scattering studies of the same crystal indicating that the ground state of the staggered iron moments is not along the (0,1,0) direction, as previously reported from polycrystalline samples studies, but slightly rotated away from this axis.

Original languageEnglish
Article number024410
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number2
DOIs
StatePublished - 2006
Externally publishedYes

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