Title :
In-situ fabrication of Y-Ba-Cu-oxide thin films by pulsed laser deposition
Author :
Bowman, R.M. ; Ferguson, A.I. ; Pegrum, C.M.
Author_Institution :
Dept. of Phys. & App. Phys., Strathclyde Univ., Glasgow, UK
fDate :
3/1/1991 12:00:00 AM
Abstract :
The authors report the in situ deposition of laser-ablated YBa2Cu3O7-δ films on MgO substrates, using the third and second harmonics of an Nd-YAG laser. The conditions needed during postdeposition oxygenation to produce the best films were investigated. Highly oriented samples were made using the third harmonic (wavelength λ=355 nm) on <100> MgO and have a transition temperature Tc of 85 K and a critical current density Jc of 1.5×105 A/cm2 at 77 K, which rises to 9×106 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 <110> and <100> SrTiO3 with λ=355 nm. Deposition on SrTiO3 has yielded lower Tc´s, probably due to poor-quality substrates. Anisotropic resistivity in films on <110> SrTiO3 has been observed, with superconducting transitions in both directions
Keywords :
barium compounds; critical current density (superconductivity); high-temperature superconductors; superconducting thin films; superconducting transition temperature; vapour deposited coatings; yttrium compounds; 355 nm; 85 K; MgO; SrTiO3; YAG:Nd; YAl5O12:Nd; YBa2Cu3O7-δ films; critical current density; high temperature superconductor; postdeposition oxygenation; pulsed laser deposition; resistivity; second harmonics; third harmonic; transition temperature; Anisotropic magnetoresistance; Conductivity; Critical current density; Laser transitions; Optical device fabrication; Optical pulses; Pulsed laser deposition; Superconducting films; Superconducting transition temperature; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
