Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7

Paul Scherrer Institut, Aargau, Switzerland
Physical review. B, Condensed matter (Impact Factor: 3.66). 02/2003; 68(2). DOI: 10.1103/PhysRevB.68.024428
Source: arXiv


The square-lattice antiferromagnet Ba2CoGe2O7 is studied by means of neutron diffraction and inelastic scattering. This material is isostructural to the well-known Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7, but exhibits commensurate long-range Neel order at low temperatures. Measurements of the spin wave dispersion relation reveal strong in-plane anisotropy that is the likely reason for the suppression of helimagnetism. Comment: 5 pages 3 figures, submitted to Phys. Rev. B

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