Preparation of thin epitaxial YBCO films by ablation using fourth harmonics of Nd:YAG laser

We have grown high-quality YBCO epitaxial films with c-axis orientation on MgO(100) and SrTiO3(100) crystalline substrates by pulsed laser deposition method using the fourth harmonics of Nd:YAG laser. The deposition conditions are followings: substrate temperature T-s=760 degrees C, oxygen pressure P-O=50Pa, laser frequency v=1Hz, and laser energy density rho=1J/cm(2)/pulse, which differ slightly from those of excimer laser. Those conditions originate from the feature of YAG laser which has a smaller pulse width and a higher peak-energy than that of excimer laser.