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Anisotropy of flux pinning properties in superconducting (Li,Fe)OHFeSe thin films

Hanisch, Jens; Huang, Y.; Li, D.; Yuan, J.; Jin, K.; Dong, X.; Talantsev, E.; Holzapfel, Bernhard; Zhao, Z.

Abstract:
The electrical transport properties of (Li,Fe)OHFeSe films have been investigated in detail. The sharply textured films, prepared by matrix-assisted hydrothermal epitaxy (MHE) on LaAlO$_{3}$, show a zero-resistance critical temperature T$_{c}$ of ~42 K, J$_{c}$ values well above 1 MA cm$^{-2}$ at low temperatures, and a maximum pinning force density F$_{P}$ of ~100 GN m$^{-3}$ at 4 K. The activation energy U$_{0}$ for thermal depinning of flux lines has been resolved for low magnetic fields, it agrees well with literature data. The coherence lengths and penetration depth were estimated via upper critical field B$_{c2}$ and self-field J$_{c}$, respectively, to be ξ$_{ab}$ ~ 2.7 nm, ξ$_{c}$ = 0.24 nm, and λ$_{ab}$ ~ 160–200 nm. The layered crystal structure leads to highly anisotropic and two-dimensional electrical properties, including trapping and lock-in of vortices.

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Verlagsausgabe §
DOI: 10.5445/IR/1000126027
Veröffentlicht am 12.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0953-2048, 1361-6668
KITopen-ID: 1000126027
Erschienen in Superconductor science and technology
Band 33
Seiten Art.-Nr.: 114009
Schlagwörter Fe-based superconductors, (Li, Fe)OHFeSe, pinning, activation energy, anisotropy, thin films
Nachgewiesen in Scopus
Web of Science
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