Synthesis, structure, and magnetic properties of the two-dimensional quantum antiferromagnets (CuBr)A2B3O10 (A=Ca, Sr, Ba, Pb; B=Nb, Ta) with the 1/3 magnetization plateau

A 1/3 magnetization plateau was recently observed in the layered perovskite (CuBr)Sr2Nb3O10 with S=1/2 CuBr layers. In order to control the cell size and thus exchange parameters, we have prepared an isostructural series of (CuBr)A2B3O10 (A=Ca, Sr, Ba, Pb; B=Nb, Ta) and investigated the magnetic properties. We found that the stability of the 1/3 magnetization plateau is systematically tunable by the lattice parameter a. A substantial role …