Artificial and self-assembled vortex-pinning centers in superconducting Ba(Fe1−xCox)2As2 thin films as a route to obtaining very high critical-current densities
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
DOI 10.1103/PhysRevB.86.214504 · Physical Review B
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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(θ, 20 T) > 105 A/cm2, and global pinning force density Fp of ∼50 GN/m3. This scenario strongly differs from the high-temperature superconducting 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 T.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.92Co0.08)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.8 | Pressure not reported | zero_resistance |
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