<i>a</i>-axis YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<i>x</i></sub>/PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<i>x</i></sub>/YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<i>x</i></sub> trilayers with subnanometer rms roughness
نویسندگان
چکیده
We demonstrate a-axis YBa2Cu3O7−x/PrBa2Cu3O7−x/YBa2Cu3O7−x trilayers grown on (100) LaAlO3 substrates with improved interface smoothness. The are synthesized by ozone-assisted molecular-beam epitaxy. thickness of the PrBa2Cu3O7−x layer is held constant at 8 nm, and YBa2Cu3O7−x layers varied from 24 nm to 100 nm. X-ray diffraction measurements show all have >97% content. rms roughness thinnest trilayer <0.7 this increases layers. also affects transport properties: while samples exhibit an onset superconducting transition above 85 K, thinner wider widths, ΔTc. High-resolution scanning transmission electron microscopy reveals coherent chemically sharp interfaces that growth begins a cubic (Y,Ba)CuO3−x perovskite phase transforms into oriented as substrate temperature ramped up.
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ژورنال
عنوان ژورنال: APL Materials
سال: 2021
ISSN: ['2166-532X']
DOI: https://doi.org/10.1063/5.0034648