INPLANE PARACONDUCTIVITY OF BI2SR2CACU2O8 SINGLE-CRYSTALS WITH DIFFERENT RESISTIVITY ANISOTROPIES

Superconducting fluctuations have been studied by systematic measureme nts of the in-plane paraconductivity in Bi2Sr2CaCu2O8 sin,ale crystals with different resistivity anisotropies. It has been observed that th e interlayer coupling strength decreases dramatically with the anisotr opy of the sample, which significantly influences the dimensional beha viour of the in-plane paraconductivity. For all the samples studied, t he in-plane paraconductivity is in good agreement with the Lawrence an d Doniach model. For the sample of highest resistivity anisotropy, the behaviour of the in-plane paraconductivity is basically two-dimension al, but deviates significantly from two-dimensional behaviour as the r esistivity anisotropy decreases.