Superconducting Bi-Sr-Ca-Cu-O thin films prepared by the pulsed-laser evaporation

We report here the preparation of the superconducting Bi-Sr-Ca-Cu-O thin films on SrTiO3(100) substrates by a Nd:YAG laser, which provides laser pulses with wavelength of 1.06µm and pulse width of 200ns. After the heat treatment at 850°C for half an hour in oxygen flow, the samples exhibit superconductivity with the zero resistance at 66.8K and the onset temperature around 84K. X-ray diffraction analyses show that the samples have the preferred orientation with the c-axis perpendicular to the substrate.