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La1-xMn1-yO3±δ buffer layers on inclined substrate deposited MgO templates for coated conductors

Troshyn, Oleksiy; Hoffmann, Christian; Große, Veit; Hänisch, Jens; Becker, Lucas; Gross, Rudolf

Abstract (englisch):
Most commercial high-temperature superconducting coated conductors based on ion beam assisted MgO deposited templates use LaMnO3 (LMO) films as the terminating buffer layer. In contrast, coated conductors based on inclined substrate deposition (ISD)-MgO technology are still produced with homoepitaxial (homoepi)-MgO as the cap layer. In this work we report on the deposition of LMO buffer layers on ISD-MgO/homoepi-MgO by electron beam physical vapor deposition. The growth parameters of textured LMO films were studied systematically and their properties were optimized regarding the critical current densitiy (Jc) of the subsequently deposited DyBa2Cu3O7-δ (DyBCO) superconducting films. LMO films without outgrowths at the surface were obtained at growth rates of up to 4 Å/s. Despite the formation of non-stoichiometric LMO films containing 59 % La, single-phase films were obtained at substrate temperatures below 775 circleC and at oxygen partial pressures of up to 4×10-4 mbar due to a large homogeneity region towards La. The Jc values of DyBCO films deposited on LMO were found to be independent of the LMO thickness in a range from 50 nm to 450 nm. ... mehr

DOI: 10.1088/1361-6668/abd5f2
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0953-2048, 1361-6668
KITopen-ID: 1000127983
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Erschienen in Superconductor science and technology
Verlag IOP Publishing
Vorab online veröffentlicht am 22.12.2020
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