Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 21, Issue 3, Pages 3192-3195Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2010.2089588
Keywords
Columnar defect; critical current density; flux pinning; high-temperature superconducting film
Funding
- Grants-in-Aid for Scientific Research [23560801] Funding Source: KAKEN
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The flux pinning behaviors for the heavy ion irradiated Er123 films are investigated based on the detailed J(c)(B,T,theta) properties. The double peaks of F-p curves for B/ /c appear in case of the matching field of 0.3 T along c-axis and 1.7 T tilted from c-axis. In addition, the peaks on J(c)(theta) at theta = 0 degrees (B/ /c), which originate from the columnar defects, decrease with increasing magnetic field but increase again near the irreversibility field. We found that the cooperation model of the c-axis correlated and random pinning centers can describe the observed double peak behavior of F-p(B) and the angular dependence of J(c) related to the correlated pinning.
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