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Understanding the nature of grain boundaries is a prerequisite for fabricating high-performance superconducting bulks and wires. For iron-based superconductors [e.g. Ba(Fe,Co) 2As 2, Fe(Se,Te), and NdFeAs(O,F)], the dependence of the critical current density Jc on misorientation angle (θGB) has been explored on [001]-tilt grain boundaries, but no data for other types of orientations have been reported. Here, we report on the structural and transport properties of Fe(Se,Te) grown on　CeO 2-buffered symmetric [010]-tilt roof-type SrTiO 3 bicrystal substrates by pulsed laser deposition. X-ray diffraction and transmission electron microscopy revealed that θGB of Fe(Se,Te) was smaller whereas θGB of CeO 2 was larger than that of the substrate. The difference in θGB between the CeO 2 buffer layer and the substrate is getting larger with increasing θGB. For θGB≥24∘ of the substrates, θGB of Fe(Se,Te) was zero, whereas θGB of CeO 2 was continuously increasing. The inclined growth of CeO 2 can be explained by the geometrical coherency model. The c-axis growth of Fe(Se,Te) for θGB≥24∘ of the substrates is due to the domain matching epitaxy on (221) planes of CeO 2. Electrical transport measurements confirmed no reduction of inter-grain Jc for θGB≤9∘, indicative of strong coupling between the grains.

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• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

Keyword: Fe(Se,Te), roof-type grain boundary, domain matching epitaxy

Date published: 2024-12-31

Publisher: Taylor & Francis

Journal:

• Science and Technology of Advanced Materials (ISSN: 14686996) vol. 25 2384829

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4704

First published URL: https://doi.org/10.1080/14686996.2024.2384829

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Updated at: 2025-07-16 16:14:48 +0900

Published on MDR: 2024-08-30 08:30:29 +0900