Influence of the oxygenation process in the critical currents of bulk melt textured YBa/sub 2/Cu/sub 3/O/sub 7/

Author

Martinez, B. ; Pinol, S. ; Gomis, V. ; Sandiumenge, F. ; Vilalta, N. ; Fontcuberta, J. ; Obradors, X.

Author_Institution

Inst. de Ciencia de Mater., CSIC, Barcelona, Spain

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1611

Lastpage

1614

Abstract

Bulk superconducting YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/ composites have been prepared through a directional solidification process allowing to obtain quasi-single crystals up to 10-12 cm in length with critical currents well above 10/sup 5/ A/cm/sup 2/ at 77 K and zero field. Low temperature oxygenation processes have been required to reach the optimal superconducting performances of the samples. For short oxygenation times, oxygen deficient bands parallel to the a-b planes have been observed while, on the other hand, an aging process has also been detected at long oxygenation times. We show that the critical currents and irreversibility lines are strongly influenced by these effects, as well as the microstructure of the samples, made evident through a careful transmission electron microscopy (TEM) investigation.<>

Keywords

ageing; barium compounds; composite superconductors; critical currents; crystal microstructure; high-temperature superconductors; oxidation; transmission electron microscopy; yttrium compounds; 10 to 12 cm; 77 K; O deficient bands; YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/; YBa/sub 2/Cu/sub 3/O/sub 7/-Y/sub 2/BaCuO/sub 5/ composites; aging; critical current; directional solidification; irreversibility lines; microstructure; oxygenation; transmission electron microscopy; Annealing; Bars; Critical current; High temperature superconductors; Magnetic field measurement; Magnetic materials; Microstructure; Optical microscopy; Superconducting epitaxial layers; Transmission electron microscopy;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402882

Filename

402882