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   https://doi.org/10.1051/epjconf/201817513008  

   Liu, Yuzhi; Bailey, Jon A.; Bazavov, A.; Bernard, C.; Bouchard, C. M.; DeTar, C.; Du, Daping; El-Khadra, A. X.; Freeland, E. D.; Gámiz, E.; et al (January 2018, EPJ Web of Conferences)
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   https://doi.org/10.3847/1538-4357/aa82bb  

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3. a -axis YBa2Cu3O7− x /PrBa2Cu3O7− x /YBa2Cu3O7− x trilayers with subnanometer rms roughness

   https://doi.org/10.1063/5.0034648  

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   We demonstrate a-axis YBa2Cu3O7−x/PrBa2Cu3O7−x/YBa2Cu3O7−x trilayers grown on (100) LaAlO3 substrates with improved interface smoothness. The trilayers are synthesized by ozone-assisted molecular-beam epitaxy. The thickness of the PrBa2Cu3O7−x layer is held constant at 8 nm, and the thickness of the YBa2Cu3O7−x layers is varied from 24 nm to 100 nm. X-ray diffraction measurements show all trilayers to have >97% a-axis content. The rms roughness of the thinnest trilayer is <0.7 nm, and this roughness increases with the thickness of the YBa2Cu3O7−x layers. The thickness of the YBa2Cu3O7−x layers also affects the transport properties: while all samples exhibit an onset of the superconducting transition at and above 85 K, the thinner samples show wider transition widths, ΔTc. High-resolution scanning transmission electron microscopy reveals coherent and chemically sharp interfaces and that growth begins with a cubic (Y,Ba)CuO3−x perovskite phase that transforms into a-axis oriented YBa2Cu3O7−x as the substrate temperature is ramped up. 

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   https://doi.org/10.1094/MPMI-05-23-0068-R  

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   https://doi.org/10.1021/acs.orglett.3c03502  

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