The square-lattice spiral magnet Ba_2CuGe_2O_7 in an in-plane magnetic field

Details The square-lattice spiral magnet Ba_2CuGe_2O_7 in an in-plane magnetic field The square-lattice spiral magnet Ba_2CuGe_2O_7 in an in-plane magnetic field

1997-07-16

arxiv.org/abs/cond-mat/9707166v1

Physics

Condensed Matter

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.56.14006

The magnetic structure of Ba_2CuGe_2O_7 is investigated by neutron diffraction in magnetic fields applied along several directions in the $(a,b)$ plane of the crystal. In relatively weak fields, $H\lesssim 0.5$~T, the propagation vector of the spin-spiral rotates to form a finite angle with the field direction. This angle depends on the orientation of $H$ itself. The rotation of the propagation vector is accompanied by a re-orientation of the plane of spin rotation in the spiral. The observed behaviour is well described by a continuous-limit form of a free energy functional that includes exchange and Dzyaloshinskii-Moriya interactions, as well as the Zeeman energy and an empirical anisotropy term.

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