Antiferromagnetism in the magnetoelectric effect single crystal LiMnPO4

Jiying Li, Wei Tian, Ying Chen, Jerel L. Zarestky, Jeffrey W. Lynn, David Vaknin

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Elastic and inelastic neutron-scattering studies reveal details of the antiferromagnetic transition and intriguing spin dynamics in the magnetoelectric effect single crystal LiMnPO4. The elastic-scattering studies confirm that the system is antiferromagnetic below TN =33.75 K with local magnetic moments (Mn2+; S=5/2) that are aligned along the crystallographic a axis. The spin-wave dispersion curves propagating along the three principal axes, determined by inelastic scattering, are adequately modeled in the linear spin-wave framework assuming a spin Hamiltonian that is parametrized by inter- and in-plane nearest- and next-nearest-neighbor interactions and by easy-plane anisotropy. The temperature dependence of the spin dynamics makes this an excellent model many-body spin system to address the question of the relationship between spin-wave excitations and the order parameter.

Original languageEnglish
Article number144410
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number14
DOIs
StatePublished - Apr 1 2009
Externally publishedYes

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