High-field critical current enhancement by irradiation induced correlated and random defects in (Ba{sub 0.6}K{sub 0.4})Fe{sub 2}As{sub 2}

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 const...

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Bibliographic Details
Published in:Applied physics letters 2013-11, Vol.103 (20)
Main Authors: Kihlstrom, K. J., Crabtree, G. W., Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, Fang, L., Jia, Y., Shen, B., Koshelev, A. E., Welp, U., Kwok, W.-K., Kayani, A., Zhu, S. F., Wen, H.-H.
Format: Article
Language:English
Subjects:
ADDITIVES
CRITICAL CURRENT
HEAVY IONS
IRON
IRON ARSENIDES
IRRADIATION
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIZATION
MATERIALS SCIENCE
POINT DEFECTS
PROTONS
SUPERCONDUCTIVITY
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Summary: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 Ba{sub 0.6}K{sub 0.4}Fe{sub 2}As{sub 2} 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 ‖ c and 5 K, the critical current density exceeds 5 MA/cm{sup 2}.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4829524