Enhancement of the critical current density by increasing the collective pinning energy in heavy ion irradiated Co-doped BaFe2As2 single crystals
SCIE
SCOPUS
- Title
- Enhancement of the critical current density by increasing the collective pinning energy in heavy ion irradiated Co-doped BaFe2As2 single crystals
- Authors
- Haberkorn, N; Kim, J; Gofryk, K; Ronning, F; Sefat, AS; Fang, L; Welp, U; Kwok, WK; Civale, L
- Date Issued
- 2015-05
- Publisher
- IOP PUBLISHING
- Abstract
- We investigate the effect of heavy ion irradiation (1.4 GeV Pb) on the vortex matter in Ba (Fe0.92Co0.08)(2)As-2 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 (J(c)), ranging from a factor of similar to 3 at low magnetic fields to a factor of similar to 10 at fields close to 1 T after irradiation with a nominal fluence of B-Phi= 3.5 T. From the normalized flux creep rates (S) and the Maley analysis, we determine that the J(c) increase can be mainly attributed to a large increment in the pinning energy, from <50 K to approximate to 500 K, while the glassy exponent mu changes from similar to 1.5 to <1. Although the enhancement of J(c) 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://oasis.postech.ac.kr/handle/2014.oak/35700
- DOI
- 10.1088/0953-2048/28/5/055011
- ISSN
- 0953-2048
- Article Type
- Article
- Citation
- SUPERCONDUCTOR SCIENCE AND TECHNOLODGY, vol. 28, no. 5, page. 55011, 2015-05
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