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High field superconducting properties of Ba(Fe₁₋ₓCoₓ)₂As₂ thin films

Hänisch, J.; Iida, K.; Kurth, F.; Reich, E.; Tarantini, C.; Jaroszynski, J.; Förster, T.; Fuchs, G.; Hühne, R.; Grinenko, V.; Schultz, L.; Holzapfel, B.

In general, the critical current density, Jc, of type II superconductors and its anisotropy with respect to magnetic field orientation is determined by intrinsic and extrinsic properties. The Fe-based superconductors of the ‘122’ family with their moderate electronic anisotropies and high yet accessible critical fields (Hc2 and Hirr) are a good model system to study this interplay. In this paper, we explore the vortex matter of optimally Co-doped BaFe2As2 thin films with extended planar and c-axis correlated defects. The temperature and angular dependence of the upper critical field is well explained by a two-band model in the clean limit. The dirty band scenario, however, cannot be ruled out completely. Above the irreversibility field, the flux motion is thermally activated, where the activation energy U0 is going to zero at the extrapolated zero-kelvin Hirr value. The anisotropy of the critical current density Jc is both influenced by the Hc2 anisotropy (and therefore by multi-band effects) as well as the extended planar and columnar defects present in the sample.

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Volltext §
DOI: 10.5445/IR/1000050803
DOI: 10.1038/srep17363
Zitationen: 24
Web of Science
Zitationen: 22
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000050803
HGF-Programm 37.06.02 (POF III, LK 01)
Erschienen in Scientific Reports
Band 5
Seiten 17363
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Scopus
Web of Science
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