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김지훈
원자제어 저차원 전자계 연구단
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Superconducting properties in heavily overdoped Ba(Fe0.86Co0.14)2As2 single crystals

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Title
Superconducting properties in heavily overdoped Ba(Fe0.86Co0.14)2As2 single crystals
Author(s)
Jeehoon Kim; Haberkorn N.; Gofryk K.; Graf M.J.; Ronning F.; Sefat A.S.; Movshovich R.; Civale L.
Publication Date
2015-01
Journal
SOLID STATE COMMUNICATIONS, v.201, no., pp.20 - 24
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
In this work we report the influence of intrinsic superconducting parameters on the vortex dynamics in an overdoped Ba(Fe1-xCox)2As2 (x=0.14) single crystal. We find a superconducting critical temperature of 13.5 K, magnetic penetration depth λab (0) = 660 ± 50 nm, coherence length ξab (0) = 5 nm, and the upper critical field anisotropy γT→Tc . 3.7. In fact, the Ginzburg- Landau model may explain the angular dependent Hc2 for this anisotropic three-dimensional superconductor. The vortex phase diagram, in comparison with the optimally doped compound, presents a narrow collective creep regime. In addition, we found no sign of correlated pinning along the c axis. Our results show that vortex core to defect size ratio and λ play an important role in the resulting vortex dynamics in materials with similar intrinsic thermal fluctuations.
URI
https://pr.ibs.re.kr/handle/8788114/1711
ISSN
0038-1098
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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