Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7

Details Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7 Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7

2003-02-27

arxiv.org/abs/cond-mat/0302592v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages 3 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.024428

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.

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