High-Field Critical Current Enhancement By Irradiation Induced Correlated And Random Defects In (Ba0.6k0.4)Fe2as2

APPLIED PHYSICS LETTERS(2013)

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摘要
Mixed pinning landscapes in superconductors are emerging as an effective strategy to achieve high critical currents in high, applied magnetic fields. Here, we use heavy-ion and proton irradiation to create correlated and point defects to explore the vortex pinning behavior of each and combined constituent defects in the iron-based superconductor Ba0.6K0.4Fe2As2 and find that the pinning mechanisms are non-additive. The major effect of p-irradiation in mixed pinning landscapes is the generation of field-independent critical currents in very high fields. At 7 T parallel to c and 5 K, the critical current density exceeds 5 MA/cm(2). (C) 2013 AIP Publishing LLC.
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