CHANGES OF THE DIMENSIONALITY AND T-C THROUGH THE IODINE INTERCALATION AND OXIDATION IN BI2SR2CACU2O8-CRYSTALS(DELTA SINGLE)

The effects of stage-one iodine intercalation and oxidation on the dim ensionality of the physical properties and on the superconducting tran sition temperature T-c have been investigated in Bi2Sr2CaCu2O8+delta s ingle crystals. Both intercalation and oxidation change the dimensiona lity of the normal-state properties from pseudo-two-dimensional to thr ee-dimensional, decrease T-c and also change the magnetic-field depend ence of the activation energy in the flux creep. The broadening of the resistive superconducting-transition under magnetic fields is suppres sed through only the oxidation. These changes through the intercalatio n and oxidation have been found to be explained by the multilayer mode l, where a high-T-c superconductor is regarded as an alternating stack of the CuO2 layer (S layer) and the block layer (N layer), taking acc ount of the proximity effect and of the redistribution of carriers to the S and N layers. We have arrived at the conclusion that the multila yer model can be one of the candidates for the model of high-T-c super conductors.