DocumentCode :
1384172
Title :
Pinning Enhancements in YBCO Films via Nanoengineered 
Composite Cap Layer
Author :
Polat, Ö ; Aytug, T. ; Paranthaman, M. ; Kim, K. ; Lupini, A.R. ; Meyer, H.M. ; Qiu, X. ; Thompson, J.R. ; Christen, D.K. ; Selvamanickam, V.
Author_Institution :
Oak Ridge Nat. Lab., Oak Ridge, TN, USA
Volume :
21
Issue :
3
fYear :
2011
fDate :
6/1/2011 12:00:00 AM
Firstpage :
3171
Lastpage :
3174
Abstract :
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.
Keywords :
barium compounds; buffer layers; flux pinning; high-temperature superconductors; lanthanum compounds; magnesium compounds; nanofabrication; pulsed laser deposition; superconducting thin films; wires; yttrium compounds; LaMnO3:MgO; YBCO; YBCO film; electrical transport measurement; high performance superconducting wire; nanocolumn; nanoengineered composite cap layer; pinning enhancement; pulsed laser deposition; Buffer layers; Substrates; Superconducting epitaxial layers; Superconducting magnets; Yttrium barium copper oxide; Critical current density; IBAD-MgO; LMO:MgO buffer layers; PLD-YBCO; phase separation;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2010.2081333
Filename :
5640685
Link To Document :
