AC and DC transport current in melt-grown YBCO

Author

Yi, Z. ; Ashworth, S. ; Beduz, C. ; Scurlock, R.G.

Author_Institution

Inst. of Cryogenics, Southampton Univ., UK

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

1506

Lastpage

1509

Abstract

It has been suggested that the transport J_c in multigrain samples of bulk YBCO is limited by the intergrain links. The authors report on preliminary measurements of intergrain currents. The intergrain critical currents in melt-grown YBCO do not appear to be as sensitive to the precise crystallographic alignment of adjacent grains as has been reported for thin films. The measured critical current of similar grain boundaries varies widely, between 15000 A/cm² and 200 A/cm² for adjacent boundaries in the same sample. Preliminary results support the conclusions of S.E. Babcock et al. (Nature, vol.347, p.167, 1990), who found weak-link-free behavior in some high-angle boundaries between bulk crystals

Keywords

barium compounds; critical current density (superconductivity); grain boundaries; high-temperature superconductors; yttrium compounds; YBa₂Cu₃O_x; crystallographic alignment; grain boundaries; high temperature superconductor; intergrain critical currents; intergrain links; multigrain samples; transport J_c; Critical current; Critical current density; Current measurement; Grain boundaries; Heating; Performance evaluation; Silver; Thermal degradation; Voltage measurement; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133469

Filename

133469