Structural analysis and transport properties of [010]-tilt grain boundaries in Fe(Se,Te)
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)2As2, Fe(Se,Te), and NdFeAs(O,F)], the dependence of the critical current density [Formula: see text] on misorientation angle...
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2024-12-01
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| Series: | Science and Technology of Advanced Materials |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/14686996.2024.2384829 |
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| Summary: | 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)2As2, Fe(Se,Te), and NdFeAs(O,F)], the dependence of the critical current density [Formula: see text] on misorientation angle ([Formula: see text]) 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 CeO2-buffered symmetric [010]-tilt roof-type SrTiO3 bicrystal substrates by pulsed laser deposition. X-ray diffraction and transmission electron microscopy revealed that [Formula: see text] of Fe(Se,Te) was smaller whereas [Formula: see text] of CeO2 was larger than that of the substrate. The difference in [Formula: see text] between the CeO2 buffer layer and the substrate is getting larger with increasing [Formula: see text]. For [Formula: see text] of the substrates, [Formula: see text] of Fe(Se,Te) was zero, whereas [Formula: see text] of CeO2 was continuously increasing. The inclined growth of CeO2 can be explained by the geometrical coherency model. The [Formula: see text]-axis growth of Fe(Se,Te) for [Formula: see text] of the substrates is due to the domain matching epitaxy on (221) planes of CeO2. Electrical transport measurements confirmed no reduction of inter-grain [Formula: see text] for [Formula: see text], indicative of strong coupling between the grains. |
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| ISSN: | 1468-6996 1878-5514 |