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Comparative study of CSD-grown BCO films with different rare earth elements: processing windows and

Erbe, M.; Cayado, P.; Freitag, W.; Ackermann, K.; Langer, M.; Meledin, A.; Hänisch, J.; Holzapfel, B.

Abstract:
REBa$_{2}$Cu$_{3}$O$_{7}$−x (REBCO, RE = rare earth) compounds with different single RE elements were grown via TFA-MOD (metal-organic deposition of trifluoroacetates) to clarify their T$_{c}$ values when grown by the same preparation method and their processing windows; here: the crystallisation temperatures at a constant process gas composition (pO$_{2}$, pH$_{2}$O). We focussed on the lanthanides (Ln) Nd, Sm, Gd, Dy, Ho, Er and Yb as substituents for Y in the REBCO phase and investigated their growth behaviour in terms of resulting physical (inductive T$_{c}$ and J$_{c}$(77 K)) and structural properties (determined by XRD, SEM, TEM). All phases were grown as pristine films on LaAlO$_{3}$ and SrTiOx$_{3}$ and compared to their respective nanocomposites with 12 mol% BaHfO$_{3}$ for in-field pinning enhancement.

With regard to T$_{c}$ and J$_{c}$(77 K), the optima of both values shift towards higher growth temperatures for increasing and decreasing RE ion size with respect to yttrium. Highest T$_{c}$ values achieved so far do not show a trend that can solely be related to the RE ionic size. On the contrary, T$_{c,90}$ values of the LnBCO compounds from Sm to Er range between 94.0 and 95.3 K and are, therefore, significantly larger than the highest values of the average-size non-lanthanide, Y, with T$_{c,90}$ = 91.5 K. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000125090
Veröffentlicht am 21.11.2021
Originalveröffentlichung
DOI: 10.1088/1361-6668/ab9aa0
Scopus
Zitationen: 7
Dimensions
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2020
Sprache Englisch
Identifikator ISSN: 0953-2048, 1361-6668
KITopen-ID: 1000125090
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Erschienen in Superconductor science and technology
Verlag IOP Publishing
Band 33
Heft 9
Seiten Art.-Nr. 094002
Vorab online veröffentlicht am 15.07.2020
Externe Relationen Abstract/Volltext
Nachgewiesen in Dimensions
Web of Science
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