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Temperature and Magnetic Field Dependence of Critical Current Density of YBCO With Varying Flux Pinning Additions

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9 Author(s)
Haugan, T.J. ; Air Force Res. Lab., Wright-Patterson AFB, OH, USA ; Baca, F.Javier ; Mullins, M.J. ; Pierce, N.A.
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The critical current density (Jc) of YBa2Cu3O7-z films doped with varying flux pinning nanoparticle additions was systematically studied, for applied magnetic fields of H = 0-9 T and operation temperatures T = 20-77 K. Films were prepared with pulsed laser deposition by (M/YBCO)N multilayer or (YBCO)1-xMx single-target methods, for different M phases including Y2O3, Y2BaCuO5 (Y211) green-phase, and BaZrO3. Very significant differences of Jc(H//c,20-77 K) were measured for optimized M phase additions, that are difficult to model or predict at present. Multilayer films with Y211 and Y2O3 nanoparticle additions had the highest Jc (20-77 K) for H < 4 T, and YBCO+BZO-nanorod samples had the strongest Jc(H) for H > 4 T and 65-77 K, however not for T < 50 K. Seemingly unusual Jc(H,T) properties were measured for (BZO/YBCO)N multilayer films when compared to YBCO and other doped films; Jc(H) was almost the same as YBCO at 77 K, however at 30 K Jc(H > 2 T) had the strongest properties increasing 70% compared to YBCO+nanoaddition films and increasing 400% compared to YBCO.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )