Increment of the collective pinning energy in Na1-xCaxFe2As2 single crystals with random point defects introduced by proton irradiation
SCIE
SCOPUS
- Title
- Increment of the collective pinning energy in Na1-xCaxFe2As2 single crystals with random point defects introduced by proton irradiation
- Authors
- Haberkorn, N; Kim, J; Maiorov, B; Usov, I; Chen, GF; Yu, W; Civale, L
- Date Issued
- 2014-09
- Publisher
- IOP PUBLISHING
- Abstract
- We study the influence of random point defects introduced by 3 MeV proton irradiation (doses 1 x 10(16) and 2 x 10(16) cm(2)) on the vortex dynamics of NaxCa1 - xFe2As2 (x = 0.5 and x = 0.75) single crystals. Our results indicate that the irradiation produces an enhancement of the critical current density and a reduction of the creep rate in vortex relaxation. The plateau in the temperature dependence of vortex creep rate initially present in as-grown single crystals disappears after irradiation. This fact can be associated with a large increment of the collective pinning energy (from <100 to 350-400 K). On the other hand, Maley analysis indicates that after irradiation both samples present a glassy exponent close to the one expected in the so-called large bundle regime (mu approximate to 7/9) for random point defects.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/35704
- DOI
- 10.1088/0953-2048/27/9/095004
- ISSN
- 0953-2048
- Article Type
- Article
- Citation
- SUPERCONDUCTOR SCIENCE & TECHNOLOGY, vol. 27, no. 9, page. 95004, 2014-09
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