Thursday, November 29, 2012

1211.6464 (C. Tarantini et al.)

Artificial and self-assembled pinning centers in Ba(Fe1-xCox)2As2 thin
films as a route to very high current density

C. Tarantini, S. Lee, F. Kametani, J. Jiang, J. D. Weiss, J. Jaroszynski, C. M. Folkman, E. E. Hellstrom, C. B. Eom, D. C. Larbalestier
We report on the superior vortex pinning of single and multilayer Ba(Fe1-xCox)2As2 thin films with self-assembled c-axis and artificially introduced ab-plane pins. Ba(Fe1-xCox)2As2 can accept a very high density of pins (15-20 vol%) without Tc suppression. The matching field is greater than 12 T, producing a significant enhancement of the critical current density Jc, an almost isotropic Jc (Theta,20T) > 10^5 A/cm2, and global pinning force density Fp of about 50 GN/m^3. This scenario strongly differs from the high temperature cuprates where the addition of pins without Tc suppression is limited to 2-4 vol%, leading to small HIrr enhancements and improved Jc only below 3-5 Tesla.
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