2-DIMENSIONAL SUPERCONDUCTING BEHAVIOR OF HG0.7CR0.3SR2CUO4+DELTA

We have measured magnetization of grain-aligned Hg0.7Cr0.3Sr2CuO4+delt a high-T-c superconductors with high magnetic fields perpendicular to the CuO2 planes. Analyses based on fluctuation magnetization models sh ow that this compound has a highly two-dimensional character, or weak coupling between the CuO2 planes. This is against the previous belief of stronger flux pinning due to a shorter interlayer distance in this compound than in the pristine HgBa2CuO4+delta. The highly two-dimensio nal character is also confirmed by the good 2D scaling behavior of hig h-field magnetization around T-c(H).