Anisotropy of the transport critical current in (110)-, (113)-, and a-axis-oriented ${\mathrm{YBa}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$ thin films

The transport critical currents of (110)-, (113)-, and a-axis-oriented ${\mathrm{YBa}}_2$ ${\mathrm{Cu}}_3$ ${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$ thin films were measured as a function of the magnetic-field direction at different temperatures (4.2–77 K) and magnetic fields (≤1.5 T). Major peaks due to the intrinsic pinning were observed when the magnetic field was parallel to the Cu-O planes while secondary peaks due to surface pinning were only seen at high temperatures. The temperature dependence of ${\mathit{J}}_{\mathit{c}}$ shows different behavior in these thin films. Possible reasons for this are discussed.