Influence of antiferromagnetic ordering on ferroelectric ordering in LuMnO3

Details Influence of antiferromagnetic ordering on ferroelectric ordering in LuMnO3 Influence of antiferromagnetic ordering on ferroelectric ordering in LuMnO3

2004-02-18

arxiv.org/abs/cond-mat/0402465v1

Phys. Rev. B 69, 134113 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.69.134113

We have studied the influence of antiferromagnetic ordering on the local dielectric moments of the MnO_5 and LuO_7 polyhedra by measuring neutron powder diffraction patterns of LuMnO_3 at temperatures near T_N. We show that the coupling is weak, because the magnetic exchange coupling is predominantly in the ab-plane of the MnO_5 trigonal bipyramids, and the electric dipole moments, originating in the LuO_7 polyhedra, are oriented along the hexagonal c-axis. Anomalies in the dielectric properties near T_N are thus caused by the geometric constraints between the MnO_5 and the LuO_7 polyhedra.

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