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Growth of YBa2Cu3O7 Films with a Packet of Parallel Grain Boundaries Spaced by Nanometer Distances

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Abstract

Substrates with crystallographic orientation (100), consisting of (100)CeO–{(100)SrTiO3–(100)CeO2} × 4 epitaxial multilayer films oriented perpendicular to the surface, have been obtained by solid-phase bonding of Y-ZrO2 fianite crystals. The CeO2 and SrTiO3 layers were exposed on the film surface by their (100) planes and the (110) faces, respectively. All formed layers were 40 nm thick. Films of high-temperature superconductor (HTSC) YBa2Cu3O7 were epitaxially grows on the substrates; a packet of parallel grain boundaries, oriented perpendicular to the surface, was formed as a result of their inheritance from the {SrTiO3–CeO2} boundaries of the multilayer internal film. The YBa2Cu3O7 film is oriented by its (001) plane and (103) face above the CeO2 and SrTiO3 regions, respectively. Thus, a packet of eight parallel 45° grain boundaries, spaced by 40 nm, is formed in the YBa2Cu3O7 film. The current–voltage characteristic of a lithographic straight-line bridge in the HTSC film intersecting this packet contains eight steps, which correspond to eight bicrystal Josephson junctions, spaced by 40 nm and connected in series.

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ACKNOWLEDGMENTS

I am grateful to the Chief Researcher of the Valiev Institute of Physics and Technology of the Russian Academy of Sciences, A.A. Lomov, for providing access to the equipment of the institute for experiments with deposition of thin films, their lithography, and electrical measurements at 4 K.

Funding

This study was supported by the Ministry of Science and Higher Education of the Russian Federation within a State assignment for the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences.

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  1. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, 119333, Moscow, Russia

    E. A. Stepantsov

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Correspondence to E. A. Stepantsov.

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Translated by A. Sin’kov

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Stepantsov, E.A. Growth of YBa2Cu3O7 Films with a Packet of Parallel Grain Boundaries Spaced by Nanometer Distances. Crystallogr. Rep. 67, 260–264 (2022). https://doi.org/10.1134/S1063774522020201

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