Title :
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
fDate :
3/1/1991 12:00:00 AM
Abstract :
It has been suggested that the transport Jc 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; YBa2Cu3Ox; crystallographic alignment; grain boundaries; high temperature superconductor; intergrain critical currents; intergrain links; multigrain samples; transport Jc; Critical current; Critical current density; Current measurement; Grain boundaries; Heating; Performance evaluation; Silver; Thermal degradation; Voltage measurement; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
