DocumentCode :
1548941
Title :
Direct identification of extended defects as vortex pinning centers in melt textured YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/ composites
Author :
Puig, T. ; Obradors, X. ; Martinez, B. ; Sandiumenge, F. ; O´Callaghan, J. ; Rabier, J.
Author_Institution :
Inst. de Ciencia de Mater., CSIC, Barcelona, Spain
Volume :
9
Issue :
2
fYear :
1999
fDate :
6/1/1999 12:00:00 AM
Firstpage :
2663
Lastpage :
2666
Abstract :
Single domain YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/ melt textured ceramic composites have revealed a very rich microstructure, which has usually impeded, by using standard measurements, to evaluate the contribution of each defect to the enhancement of the critical current. We have measured the in-plane magnetoresistance anisotropy and the anisotropic in-plane inductive critical currents and we show that together with the microstructural TEM analysis, the contribution of the different extended pinning centers can be separated. These results have allowed us to infer the kind of microstructure modifications required to improve the critical current. In particular, we present an isostatic pressing deformation technique as a very promising post-processing treatment to strongly increase the critical currents of these composites.
Keywords :
barium compounds; ceramics; composite superconductors; critical currents; crystal microstructure; extended defects; flux pinning; high-temperature superconductors; hot pressing; magnetoresistance; melt texturing; transmission electron microscopy; yttrium compounds; YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/; anisotropic in-plane inductive critical currents; critical current; extended defects; extended pinning centers; in-plane magnetoresistance anisotropy; isostatic pressing deformation technique; melt textured YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/ composites; microstructural TEM analysis; microstructure; post-processing treatment; single domain YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/ melt textured ceramic composites; vortex pinning centers; Anisotropic magnetoresistance; Composite materials; Critical current; Current measurement; Flux pinning; Magnetic field measurement; Microstructure; Stacking; Superconducting materials; Tunneling magnetoresistance;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/77.785034
Filename :
785034
Link To Document :
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