Title :
Cooperative Behavior of the Random and Correlated Pinning in Er123 Films With Columnar Defects
Author :
Awaji, Satoshi ; Namba, Masafumi ; Watanabe, Kazuo ; Ito, Shun ; Aoyagi, Eiji ; Kai, Hideki ; Mukaida, Masashi ; Okayasu, Satoru
Author_Institution :
High Field Lab. for Supercond. Mater., Tohoku Univ., Sendai, Japan
fDate :
6/1/2011 12:00:00 AM
Abstract :
The flux pinning behaviors for the heavy ion irradiated Er123 films are investigated based on the detailed Jc(B,T,θ) properties. The double peaks of Fp 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 Jc(θ) at θ = 0°(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 Fp(B) and the angular dependence of Jc related to the correlated pinning.
Keywords :
barium compounds; critical current density (superconductivity); erbium compounds; flux pinning; high-temperature superconductors; ion beam effects; superconducting thin films; ErBa2Cu3O7; angular dependence; columnar defects; correlated pinning; critical current density; flux pinning; heavy ion irradiated films; high-temperature superconducting film; random pinning centers; Critical current density; Force; High temperature superconductors; Indium tin oxide; Magnetic flux; Magnetic resonance imaging; Superconducting magnets; Columnar defect; critical current density; flux pinning; high-temperature superconducting film;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2089588
