Evolution of the 2D antiferromagnetism with temperature and magnetic field in multiferroic Ba${}_2$CoGe${}_2$O${}_7$

V. Hutanu, A. P. Sazonov, M. Meven +11

We report on spherical neutron polarimetry and unpolarized neutron diffraction in zero magnetic field as well as flipping ratio and static magnetization measurements in high magnet…