Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7
A. Zheludev, T. Sato, T. Masuda, K. Uchinokura, G. Shirane, B. Roessli
TL;DR
This study investigates the magnetic properties of Ba2CoGe2O7, revealing that in-plane anisotropy suppresses helimagnetism and leads to commensurate antiferromagnetic order, using neutron diffraction and inelastic scattering.
Contribution
It provides new insights into how in-plane anisotropy influences magnetic ordering in Ba2CoGe2O7, contrasting with related helimagnetic compounds.
Findings
Ba2CoGe2O7 exhibits commensurate Neel order at low temperatures.
Strong in-plane anisotropy suppresses helimagnetism.
Spin wave dispersion shows significant anisotropy.
Abstract
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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