The magnetization vs, field curves of Ba3Cu2O4Cl2 single crystals show a sp
in-flop transition at a threshold field of 2.6 T for temperatures below T-N
approximate to 20 K and fields parallel to the orthorhombic a-axis. No met
amagnetic transition was detected for fields parallel to the b- or c-axis.
Above T-N a Curie-Weiss behaviour is found with moments characterized by an
isotropic g-factors. (C) 1999 Elsevier Science B.V. All rights reserved.