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

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3 Author(s)
Bowman, R.M. ; Dept. of Phys. & App. Phys., Strathclyde Univ., Glasgow, UK ; Ferguson, A.I. ; Pegrum, C.M.

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

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )