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Enhancement of critical current density in YBa2Cu3Ox superconductor by mechanical deformation

Published online by Cambridge University Press:  31 January 2011

V. Selvamanickam ,
M. Mironova  and
K. Salama
V. Selvamanickam
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, Texas 77004
M. Mironova
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, Texas 77004
K. Salama
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, Texas 77004
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Abstract

The critical current density of melt-textured YBa2Cu3Ox superconductor has been enhanced by mechanical deformation at a high temperature. Hot deformation at 45° to both the slip plane (001) and the slip directions [100]/[010] has resulted in a high density of dislocation loops and stacking faults. The deformed samples are found to exhibit a critical current density (Jc) at Hc-axis as high as that at Ha-b plane at 1.5 T and 77 K. A Jc of 35300 A/cm2 has been achieved at Hc (1.5 T and 77 K) which is twice as high as that observed in undeformed samples. The enhanced Jc in this magnetic field orientation is attributed to pinning by the defects created by mechanical deformation. This pinning mechanism is found to be effective over a wide angle between the magnetic field and the a-b plane and thus results in a marked reduction in the critical current anisotropy.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 2 , February 1993 , pp. 249 - 254
Copyright
Copyright © Materials Research Society 1993

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