Published in
Institute of Electrical and Electronics Engineers, IEEE Transactions on Applied Superconductivity, 2(13), p. 2481-2483, 2003
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Fabrication of high J/sub c/YBa/sub 2/Cu/sub 3/O//sub 7-γ/ tapes using the newly developed lanthanum manganate single buffer layers
,
T. Aytug,
S. Kang,
R. Feenstra,
J. D. Budai,
D. K. Christen,
P. N. Arendt,
L. Stan,
J. R. Groves,
R. F. DePaula,
S. R. Foltyn,
T. G. Holesinger
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Abstract
High JcYBa2Cu3O7-δ (YBCO) films have been fabricated on LaMnO3 buffered ion-beam assisted deposition (IBAD) MgO template layers. A LaMnO3 buffer layer is compatible with MgO surfaces and also provides a good template for growing high current density YBCO films. LaMnO3 buffer layers were deposited using rf magnetron sputtering. On LaMnO3-buffered-MgO [100] single crystal substrates, YBCO films with a Jc of over 4 M/cm2 were grown using both pulsed laser deposition (PLD) and ex-situ BaF2 process. Using PLD, Jc of 1.8 MA/cm2 at 77 K was obtained on 200-nm-thick YBCO films grown on LaMnO3-buffered MgO IBAD/Ni-alloy substrates. In addition, an Ic of 230 A/cm-width was obtained for 1.65-μm-thick YBCO films grown on LaMnO3-buffered MgO IBAD/Ni-alloy substrates using PLD at Los Alamos National Laboratory. This performance is comparable to the best single-layer results achieved on IBAD-MgO substrates.