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Ion-beam assisted deposition of bi-axially aligned MgO template films for YBCO coated conductors

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10 Author(s)
Groves, J.R. ; Mater. Sci. Div., Los Alamos Nat. Lab., NM, USA ; Arendt, P.N. ; Foltyn, S.R. ; DePaula, R.F.
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We report the results of experiments with ion-beam-assisted deposition (IBAD) of MgO using in-situ monitoring with Reflected High-Energy Electron Diffraction (RHEED). Strips of polished Haynes 242 and Inconel 625 nickel-based super-alloys have been used as substrates for these experiments. The in-plane texture of the MgO, as measured by X-ray /spl phi/ scan, resulted in FWHM values between 11 and 15/spl deg/. Using pulsed-laser deposition, the IBAD MgO template films were then overcoated with buffer layer films and a final superconducting film of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//. The best superconducting transport properties measured on these YBCO films were: an Ic (75 K, self-field, 1 cm wide) of 41.6 A, and a narrow-bridge J/sub c/ (1.35 /spl mu/m thick film) of 0.46 MA/cm/sup 2/.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )