Fig. 1
From: Magnetic field-induced ferroelectricity in S = 1/2 kagome staircase compound PbCu3TeO7

Crystal structure and magnetic susceptibility of PbCu3TeO7 single crystals. Crystal structures viewed along a the b-axis with all atoms and along b the a-direction showing the staircase kagome structure with spine Cu ions (green) and cross-tie Cu ions (blue). c Possible intralayer exchange interactions denoted from J1 to J8 in the order of the distance. d Temperature-dependent magnetic susceptibility data along each field direction