Anisotropy in transport critical current density of a Bi-Sr-Ca-Cu-oxide single crystal

Abstract

Critical current densities and upper critical fields were measured for a single crystal of the high Tc oxide superconductor, Bi2Sr2CaCu2O8+d, by transport within the ab basal plane and along the c axis. The anisotropy in critical current densities was observed to be Jc⊥/Jc∥=10, in agreement with the anisotropy in resistivity for the normal state. The scaling of the critical current density with the magnetic field was found. The critical current density scaled to zero at fields Bc2 in the ab plane and along the c axis which were in good agreement with the upper critical fields measured by transport.