| Budget Amount *help |
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2014: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
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| Outline of Final Research Achievements |
In this work, we studied the effect of systematically-controlled size and density of strong-pinning random BaZrO3 nanoparticles (NPs) by engineering of their inclusion in BaFe2(As0.66P0.33)2 films. The critical current density (Jc) gradually increases from that of pure Ba122:P to that of 3mol.%BZO with the increasing density of NPs. The nearly isotropic Jc values for BZO doped Ba122:P films are well over 1.5 MA cm-2 at 15 K and 1 T. The flux-creep rate measures the rate at which vortices exit pinning centers as a result of fluctuations. These fluctuations enable vortex depinning via different types of excitations, thus effectively reducing Jc. We find that S is significantly reduced with respect to that of Ba122:P when NPs are included. The maximum improvement produced by the NP additions in Jc(H) occurs when the elastic energy is minimized and thermal activation effects reduced by the strong pinning of a high density of BZO NPs.
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