Spin-Lattice Coupling Across the Magnetic Quantum-Phase Transition in Copper-Containing Coordination Polymers
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99 GENERAL AND MISCELLANEOUS↗
Engineering topics
Ozerov, M.
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Magnetoelastic distortion of multiferroic BiFeO 3 in the canted antiferromagnetic state
Using THz spectroscopy, here we show that the spin-wave spectrum of multiferroic BiFeO 3 in its high-field canted antiferromagnetic state is well described by a spin model that violates rhombohedral symmetry. We demonstrate that the monoclinic distortion of the canted antiferromagnetic state is induced by the single-ion magnetoelastic coupling between the lattice and the two nearly antiparallel spins. The revised spin model for BiFeO 3 contains two new single-ion anisotropy terms that violate rhombohedral symmetry and depend on the direction of the magnetic field.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗