Pinning Enhancements in YBCO Films via Nanoengineered LaMnO3:MgO Composite Cap Layer

作者：Polat Oe^*; Aytug T; Paranthaman M; Kim K; Lupini A R; Meyer H M; Qiu X; Thompson J R; Christen D K; Selvamanickam V

来源：IEEE Transactions on Applied Superconductivity, 2011, 21(3): 3171-3174.

DOI：10.1109/TASC.2010.2081333

• Critical current density
• IBAD-MgO
• LMO:MgO buffer layers
• phase separation
• PLD-YBCO

In the present work, composite LaMnO3 : MgO (LMO:MgO) cap buffer layers with varying MgO contents 5 vol% up to 75 vol% have been grown on homo-epi MgO/IBAD(MgO) substrates to enhance the performance of YBa2Cu3O7-x (YBCO) films. Results showed formation of phase separated MgO nanocolumns within the LMO matrix. The impact of these nanocolumns on the superconducting properties of YBCO films deposited using pulsed laser deposition (PLD) on the nanostructured layer was investigated by electrical transport measurements. Such YBCO films showed better in-field performance compared to that of YBCO films on standard LMO cap films. In particular, measurements of the field-angle dependence revealed c-axis correlated pinning for YBCO films on these composite cap layers. The present results demonstrate a practical approach to obtain high performance superconducting wires.

• 出版日期2011-6