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Nanoscale Texture and Microstructure in a NdFeAs(O,F)/IBAD-MgO Superconducting Thin Film with Superior Critical Current Properties

Guo, Zimeng; Gao, Hongye; Kondo, Keisuke; Hatano, Takafumi; Iida, Kazumasa; Hänisch, Jens ORCID iD icon 1; Ikuta, Hiroshi; Hata, Satoshi
1 Institut für Technische Physik (ITEP), Karlsruher Institut für Technologie (KIT)

Abstract:

This paper reports the nanoscale texture and microstructure of a high-performance NdFeAs(O,F) superconducting thin film grown by molecular beam epitaxy on a textured MgO/Y2O3/Hastelloy substrate. The NdFeAs(O,F) film forms a highly textured columnar grain structure by epitaxial growth on the MgO template. Although the film contains stacking faults along the ab-plane as well as grain boundaries perpendicular to the ab-plane, good superconducting properties are measured: a critical temperature, T-c, of 46 K and a self-field critical current density, J(c), of 2 x 10(6) A/cm(2) at 4.2 K. Automated crystal orientation mapping by scanning precession electron diffraction in transmission electron microscope is employed to analyze the misorientation angles between adjacent grains in a large ensemble (247 grains), and 99% of the grain boundaries show in-plane misorientation angles (Delta gamma) less than the critical angle theta(c), which satisfies one of the necessary conditions for the high J(c). Comparing the columnar grain size distribution with the mean distance of the flux line lattice, the triple junctions of low-angle grain boundaries are found to be effective pinning centers, even at high temperatures (>= 35 K) and/or low magnetic fields.


Verlagsausgabe §
DOI: 10.5445/IR/1000137377
Veröffentlicht am 14.09.2021
Originalveröffentlichung
DOI: 10.1021/acsaelm.1c00364
Scopus
Zitationen: 5
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2021
Sprache Englisch
Identifikator ISSN: 2637-6113, 2637-6113
KITopen-ID: 1000137377
HGF-Programm 38.05.03 (POF IV, LK 01) High Temperature Superconductivity
Erschienen in ACS applied electronic materials
Verlag American Chemical Society (ACS)
Band 3
Heft 7
Seiten 3158–3166
Vorab online veröffentlicht am 09.07.2021
Nachgewiesen in Scopus
Web of Science
Dimensions
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