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Increment of the collective pinning energy in Na1-xCaxFe2As2 single crystals with random point defects introduced by proton irradiation

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Title
Increment of the collective pinning energy in Na1-xCaxFe2As2 single crystals with random point defects introduced by proton irradiation
Author(s)
N Haberkorn; Jeehoon Kim; Maiorov, B; Usov, I; Chen, GF; Yu, W; Civale, L
Publication Date
2014-09
Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, v.27, no.9, pp.95004 -
Publisher
IOP PUBLISHING LTD
Abstract
We study the influence of random point defects introduced by 3 MeV proton irradiation (doses 1×1016 and 2 × 1016 cm2) 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 μ close to the one expected in the so-called large bundle regime (μ≈7/9) for random point defects.
URI
https://pr.ibs.re.kr/handle/8788114/1466
ISSN
0953-2048
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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