Transport properties across high-angle bicrystals of melt-textured YBa/sub 2/Cu/sub 3/O/sub 6+x/

Author

Field, M.B. ; Cai, X.Y. ; Babcock, S.E. ; Larbalestier, D.C.

Author_Institution

Appl. Superconductivity Center, Wisconsin-Madison Univ., WI, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1479

Lastpage

1482

Abstract

The transport properties of eight individual bicrystals in melt-textured YBa/sub 2/Cu/sub 3/O/sub 6+x/ were investigated in low and high fields at 4 K and 77 K. Bicrystals were cut from samples produced by the melt texture process with 10% and 20% added Y/sub 2/BaCuO/sub 5/. Misorientations between the crystals were determined by pole figure analysis, backscatter channeling patterns and light microscopy. The bicrystals exhibited a wide range of misorientations in both the ab planes and c-axis direction and all boundaries were high angle. Contrary to many reported expectations for melt-textured materials, all of the grain boundaries were weakly coupled. However, the strength of the coupling varied with misorientation angle and a weaker field dependence of J/sub c/ was observed in the samples with lower misorientation angle and lower grain boundary resistivity.<>

Keywords

barium compounds; bicrystals; channelling; critical current density (superconductivity); grain boundaries; high-temperature superconductors; yttrium compounds; 4 K; 77 K; Y/sub 2/BaCuO/sub 5/; YBa/sub 2/Cu/sub 3/O/sub 6+x/; backscatter channeling patterns; crystal misorientation; grain boundaries; grain boundary resistivity; high temperature superconductors; high-angle bicrystals; light microscopy; melt-textured; pole figure analysis; transport properties; Backscatter; Conductivity; Crystalline materials; Crystals; Grain boundaries; Microscopy; Pattern analysis; Superconducting materials; Superconducting thin films; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233615

Filename

233615