Weak antiferromagnetism due to Dzyaloshinskii-Moriya interaction in Ba${}_3$Cu${}_2$O${}_4$Cl${}_2$

V. Yushankhai, M. Wolf, K. -H. Mueller +2

The antiferromagnetic insulating cuprate Ba${}_3$Cu${}_2$O${}_4$Cl${}_2$ contains folded CuO${}_2$ chains with four magnetic copper ions ($S=1/2$) per unit cell. An underlying multiorbital H…