Pinning Enhancements in YBCO Films via Nanoengineered ${\\rm LaMnO}_{3}$:${\\rm MgO}$ 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 YBa₂Cu₃O_7-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

Pinning Enhancements in YBCO Films via Nanoengineered Composite Cap Layer

Polat, Ö ; Aytug, T. ; Paranthaman, M. ; Kim, K. ; Lupini, A.R. ; Meyer, H.M. ; Qiu, X. ; Thompson, J.R. ; Christen, D.K. ; Selvamanickam, V.

jour

Pinning Enhancements in YBCO Films via Nanoengineered ${\\rm LaMnO}_{3}$:${\\rm MgO}$ Composite Cap Layer