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Enhancement of the critical current density by increasing the collective pinning energy in heavy ion irradiated Co-doped BaFe2As2 single crystals

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Title
Enhancement of the critical current density by increasing the collective pinning energy in heavy ion irradiated Co-doped BaFe2As2 single crystals
Author(s)
Haberkorn N.; Jeehoon Kim; Gofryk K.; Ronning F.; Sefat A.S.; Fang L.; Welp U.; Kwok W.K.; Civale L.
Publication Date
2015-05
Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, v.28, no.5, pp.055011 -
Publisher
IOP PUBLISHING LTD
Abstract
We investigate the effect of heavy ion irradiation (1.4 GeV Pb) on the vortex matter in Ba (Fe0.92Co0.08)2As2 single crystals by superconducting quantum interference device (SQUID) magnetometry. The defects created by the irradiation are discontinuous amorphous tracks, resulting in an effective track density smaller than 25% of the nominal doses. We observe large increases in the critical current density (Jc), ranging from a factor of ∼3 at low magnetic fields to a factor of ∼10 at fields close to 1 T after irradiation with a nominal fluence of BΦ = 3.5 T. From the normalized flux creep rates (S) and the Maley analysis, we determine that the Jc increase can be mainly attributed to a large increment in the pinning energy, from <50 K to ≈500 K, while the glassy exponent μ changes from ∼1.5 to <1. Although the enhancement of Jc is substantial in the entire temperature range and S is strongly suppressed, the artificial pinning landscape induced by the irradiation does not modify significantly the crossover to fast creep in the field-temperature vortex phase diagram.
URI
https://pr.ibs.re.kr/handle/8788114/1675
ISSN
0953-2048
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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