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arXiv · 1211.6464

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
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Abstract

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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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. 2012-11-27. Artificial and self-assembled pinning centers in Ba(Fe1-xCox)2As2 thin films as a route to very high current density. https://doi.org/10.1103/physrevb.86.214504

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