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 language | English |
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Article number | 144410 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 79 |
Issue number | 14 |
DOIs | |
State | Published - Apr 1 2009 |
Externally published | Yes |