A. Levy, J.P. Falck, et al.
Journal of Applied Physics
Frequency-doubled Nd laser (532 nm) pulses of 1.7 J/cm2 and 10 ns duration were used to deposit thin films of YBa2 Cu3 O7-δ by laser ablation on NdGaO3, LaGaO 3, and SrTiO3 substrates held at 725±5°C in 0.2 Torr of O2 ambient. Electrical resistivities versus temperature of all films show normal metallic behavior and sharp superconducting transitions with Tc (R=0) at 92-93 K. Critical current densities in 0.3-0.6 μm thick, 200 μm long, and 10-30 μm wide strips were measured to be 10 6 A/cm2 at 60, 77, and 80 K in the films on LaGaO 3, NdGaO3, and SrTiO3, respectively. X-ray diffraction patterns show that all films grew epitaxially, with domains of only two crystalline orientations rotated 90°with respect to each other in the a-b plane (consistent with twins), and the c axis perpendicular to the substrates. The closely matched lattice constants of the film and substrates (0.8-2.1%) result in epitaxial growth of the films.
A. Levy, J.P. Falck, et al.
Journal of Applied Physics
C.E. Otis, A. Gupta, et al.
Applied Physics Letters
A. Kussmaul, J.S. Moodera, et al.
Applied Physics Letters
E.A. Giess, J.D. Kuptsis, et al.
Journal of Crystal Growth