In-situ fabrication of Y-Ba-Cu oxide thin films by pulsed laser deposition

This paper reports the in-situ deposition of laser-ablated YBa2Cu3O7-δ films on MgO substrates, using the third and second harmonics of a Nd-YAG laser. The authors investigate the conditions needed during post-deposition oxygenation to produce the best films. The authors highly-oriented samples are made using the third harmonic (wavelength λ = 355 nm) on left-angle 100 right-angle MgO and have a transition temperature Tc of 85K, a critical current density Jc of 1.5 x 105 A/cm2 at 4.2 K. Films made with the second harmonic on MgO are, as expected, markedly poorer in quality. Highly-oriented films have also been made on left-angle 110 right-angle and left-angle 100 right-angle SrTiO3 with λ = 355 nm