Direct growth of LaMnO 3 cap buffer layers on ion-beam-assisted deposition MgO for simplified template-based YBa 2 Cu 3
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Aytug,a) M. Paranthaman, K. Kim, and Y. Zhang Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
J.R. Thompson Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200; and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
D.K. Christen Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
X. Xiong and V. Selvamanickam SuperPower, Inc., Schenectady, New York 12304 (Received 5 May 2008; accepted 4 August 2008)
Simplification of the ion-beam-assisted deposition (IBAD) buffer architecture is one of the key issues for reduced manufacturing cost of second-generation superconducting wire production. In this work, we studied various radio frequency magnetron sputter deposition conditions for epitaxial growth of LaMnO3 (LMO) layers, with varying thicknesses, directly on IBAD-MgO without homo-epitaxial MgO layers. Performance of the simplified LMO/IBAD-MgO samples was qualified by pulsed-laser-deposited 1-m-thick YBa2Cu3O7−␦ (YBCO) coatings. Detailed property characterizations revealed that though the growth temperature has a substantial effect on the texture of LMO layers, neither LMO thickness nor different sputter gas compositions had a significant effect on the performance of YBCO films. The superconducting properties of YBCO on LMO/IBAD-MgO are found to be similar to those obtained on templates having homo-epitaxial MgO layers. The present results underscore the strong potential of LMO as a single cap layer directly on IBAD-MgO for the development of a simplified IBAD architecture.
I. INTRODUCTION
The first-generation Bi-based high-temperature superconducting (HTS) wires have had limited impact on industrial applications due to their high-cost and low current carrying capability in the presence of moderate magnetic fields (
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