Experimental evidence for Shekhtman-Entin-Wohlman-Aharony (SEA) interactions in Ba2CuGe2O7

Abstract

New neutron diffraction and inelastic neutron scattering experiments on Ba2CuGe2O7 suggest that the previously suggested model for the magnetism of this material (an ideal sinusoidal spin spiral, stabilized by isotropic exchange and Dzyaloshinskii-Moriya interactions) needs to be refined. Both new and previously published experimental results can be quantitatively explained by taking into account the Shekhtman-Entin-Wohlman-Aharony (SEA) term, a special anisotropy term that was predicted to always accompany Dzyaloshinskii-Moriya interactions in insulators. Our experimental results present the first clear evidence to that SEA interactions can lead to substantial observable effects in a real magnetic system.

4 pages (RevTex), 4 figures (PS)

References in corpus (5)

• Anisotropic Spin Hamiltonians due to Spin-Orbit and Coulomb Exchange Interactions
• Field-induced Commensurate-Incommensurate phase transition in a Dzyaloshinskii-Moriya spiral antiferromagnet
• Field-induced incommensurate-to-commensurate transition in Ba_2CuGe_2O_7
• Static properties of a quasi one-dimensional antiferromagnet in magnetic field
• The square-lattice spiral magnet Ba_2CuGe_2O_7 in an in-plane magnetic field

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