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

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.

20 pages,8 figures. Accepted for publication in Physical Review B

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• Recent advances in iron-based superconductors toward applications
• Artificially engineered superlattices of pnictide superconductor
• Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates
• Fe-based superconducting thin films on metallic substrates: growth, characteristics and relevant properties
• Strong-pinning regimes by spherical inclusions in anisotropic type-II superconductors
• Development of very high Jc in Ba(Fe1-xCox)2As2 thin films grown on CaF2
• Oxypnictide SmFeAs(O,F) superconductor: a candidate for high-field magnet applications
• Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure
• Critical current anisotropy in Nd-1111 single crystals and the infuence of neutron irradiation
• Tunable superconductivity in Fe-pnictide heterointerfaces by diffusion control
• Enhancement of the critical current by surface irregularities in Fe-based superconductors
• Magnetic mapping of defects in type-II superconductors
• One-dimensional pinning behavior in Co-doped BaFe2As2 thin films