Abstract
The quasi-dimensional square-lattice antiferromagnet Ba 2CuGe 2O 7 was studied by neutron scattering and bulk magnetic techniques. An incommensurate magnetic spiral structure with the propagation vector (1 + ξ, ξ,0) ( ξ = 0.027) was observed below T N = 3.26 K. The spin dynamics can be adequately described by conventional spin-wave theory with two exchange constants: nearest-neighbor in-plane antiferromagnetic coupling J 1 ≈ 0.48 meV and interplane ferromagnetic interaction J 3 ≈ 0.013 meV. This set of exchange parameters apparently fails to explain the spiral order. The non-centrosymmetric crystal structure suggests that the incommensurate phase may be the result of a Dzyaloshinskii-Moriya instability of the Neel ground state.
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