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Effects of shock-induced defects on flux pinning in YBa sub 2 Cu sub 3 O sub 7-. delta

Conference ·
OSTI ID:5733132
A composite specimen of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} and silver was fabricated by shock-compacting to 167 kbar a mixture of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} and silver powders. The magnetic flux pinning energy of this specimen was then measured as a function of temperature using flux relaxation data obtained with a SQUID magnetometer. Our results show that the pinning energy of the shock-compacted sample is significantly higher than the pinning energy of the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} before compaction. The increase in flux pinning energy is presumably due to the introduction of shock-induced defects into the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}. This result is significant because higher pinning energies imply higher intragranular critical currents. 8 refs., 1 tab.
Research Organization:
Lawrence Livermore National Lab., CA (USA)
Sponsoring Organization:
DOD; DOE/DP
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
5733132
Report Number(s):
UCRL-101900; CONF-890718--30; ON: DE90000824
Country of Publication:
United States
Language:
English