Pressure dependence of Bi-Sr-Ca-Cu-O phases with laser deposition technique

Superconducting Bi2Sr2Can−1CunOx (n=1,2,3) films, with the c-axis perpendicular to the films, were fabricated by laser deposition. Oxygen pressure was found to be important to control the phases, and a unique pressure dependence of Bi-Sr-Ca-Cu-O phases was shown by these films. Tc of 76 K and Jc of 1.5×105 A/cm2 at 40 K were achieved for the in situ Bi2Sr2CaCu2Ox film. The critical-current densities in the external magnetic field up to 5 T with the fields parallel and perpendicular to the c-axis of the film were measured.