Spin nematic interaction in multiferroic compound Ba${}_2$CoGe${}_2$O${}_7$

M. Soda, M. Matsumoto, M. Mansson +4

We demonstrate the existence of the spin nematic interactions in an easy-plane type antiferromagnet Ba${}_2$CoGe${}_2$O${}_7$ by exploring the magnetic anisotropy and spin dynamics…