Chemical CeO<sub>2</sub>-Based Buffer Layers for Fe(Se,Te) Films

Piperno, Laura; Vannozzi, Angelo; Augieri, A.; Pinto, Valentina; Armenio, A. Angrisani; Rizzo, Francesco; Mancini, A.; Rufoloni, A.; Celentano, G.; Braccini, V.; Cialone, Matteo; Iebole, Michela; Manca, Nicola; Martinelli, Alberto; Putti, M.; Sotgiu, Giovanni; Meledin, Alexander

doi:10.1109/tasc.2022.3142709

Cited by 8 publications

(17 citation statements)

References 29 publications

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“…Such a Fe(Se,Te) film displays a good superconducting performance, such as a J c s.f. = 1.1 MA cm −2 at 4.2 K, and a T c = 17.1 K. This work builds up on previously published studies from this group 8 , 9 , 18 , elucidating the role of the seed layer on the final film properties and analyzing in detail the transport properties of the superconductor prepared under optimal conditions, whose understanding could be useful in the perspective of Fe(Se,Te) film growth on metallic templates.…”

Section: Introductionmentioning

confidence: 65%

“…Structural characterization was carried out by X-ray diffraction (XRD) using a Rigaku GeigerFlex diffractometer equipped with a Cu-radiation source and a monochromator on the diffracted beam in Bragg–Brentano configuration for both θ –2 θ and ω -scans. ω -scans were fitted using a pseudo-Voigt curve as in 8 , 9 , 18 .…”

Section: Methodsmentioning

confidence: 99%

“…XRD (111) ϕ -scan measurements were carried out in a SmartLab Rigaku diffractometer equipped with an Eulerian Cradle, using a Cu K α1 radiation. Due to the different crystal phases of CeO 2 (cubic) and Fe(Se,Te) (PbO-like tetragonal), the χ angle was fixed at 54.7° and 65.5° during the scan, respectively as in 8 , 9 , 18 .…”

Section: Methodsmentioning

confidence: 99%

“…200–400 °C, in ultra-high vacuum conditions) with respect to REBCO (> 800 °C, in oxidizing conditions). It follows that the CC template can be extremely simplified, moving from the complex multilayered buffer architecture necessary in REBCO CCs to promote a sharp texture and to protect from substrate ion diffusion, to the 1–2 layers required for Fe(Se,Te) 4 , 9 , 10 , 18 . In this case, deposition on bare metallic substrate led to suppression of superconductivity due to metallic ion contamination, but it was demonstrated that single CeO 2 buffer layer is sufficient to prevent contamination of Fe(Se,Te) film 8 .…”

Section: Introductionmentioning

confidence: 99%

“…A significant breakthrough towards low-cost Fe-based coated conductor would be the replacement of PLD-grown buffer layer using chemical solution deposition (CSD) for the growth of the buffer 9 , 25 – 31 . Recently, it was reported that Zr-doped CeO 2 films deposited via the CSD method known as Metal Organic Decomposition (MOD) can act as reliable buffers on YSZ substrates, one of the most adopted substrates for applications, for high quality superconducting Fe(Se,Te) films 9 , 18 .…”

Section: Introductionmentioning

confidence: 99%

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High-performance Fe(Se,Te) films on chemical CeO2-based buffer layers

Piperno

Vannozzi

Augieri

et al. 2023

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The fabrication of a Fe-based coated conductor (CC) becomes possible when Fe(Se,Te) is grown as an epitaxial film on a metallic oriented substrate. Thanks to the material’s low structural anisotropy, less strict requirements on the template microstructure allow for the design of a simplified CC architecture with respect to the REBCO multi-layered layout. This design, though, still requires a buffer layer to promote the oriented growth of the superconducting film and avoid diffusion from the metallic template. In this work, Fe(Se,Te) films are grown on chemically-deposited, CeO2-based buffer layers via pulsed laser deposition, and excellent properties are obtained when a Fe(Se,Te) seed layer is used. Among all the employed characterization techniques, transmission electron microscopy proved essential to determine the actual effect of the seed layer on the final film properties. Also, systematic investigation of the full current transport properties J(θ, H, T) is carried out: Fe(Se,Te) samples are obtained with sharp superconducting transitions around 16 K and critical current densities exceeding 1 MA cm−2 at 4.2 K in self-field. The in-field and angular behavior of the sample are in line with data from the literature. These results are the demonstration of the feasibility of a Fe-based CC, with all the relative advantages concerning process simplification and cost reduction.

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Section: Introductionmentioning

confidence: 65%