Antiferromagnetism in the magnetoelectric effect single crystal LiMnPO4

TitleAntiferromagnetism in the magnetoelectric effect single crystal LiMnPO4
Publication TypeJournal Article
Year of Publication2009
AuthorsLi JY, Tian W, Chen Y, Zarestky JL, Lynn JW, Vaknin D
Journal TitlePhysical Review B
Date Published04/01
ISBN Number1098-0121
Accession NumberISI:000265943200072
Keywordsantiferromagnetic materials, lifepo4, linipo4, lithium compounds, magnetic anisotropy, magnetic transitions, magnetic-properties, magnetoelectric effects, manganese compounds, spin dynamics, spin hamiltonians, spin waves, temperature, weak ferromagnetism

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 T-N=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.

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