%0 Journal Article
%A Suyolcu, Y. Eren
%A Sun, Jiaxin
%A Goodge, Berit H.
%A Park, Jisung
%A Schubert, Jürgen
%A Kourkoutis, Lena F.
%A Schlom, Darrell G.
%T a -axis YBa 2 Cu 3 O 7− x /PrBa 2 Cu 3 O 7− x /YBa 2 Cu 3 O 7− x trilayers with subnanometer rms roughness
%J APL materials
%V 9
%N 2
%@ 2166-532X
%C Melville, NY
%I AIP Publ.
%M FZJ-2021-04858
%P 021117 -
%D 2021
%X We demonstrate a-axis YBa 2 Cu 3 O 7−x /PrBa 2 Cu 3 O 7−x /YBa 2 Cu 3 O 7−x trilayers grown on (100) LaAlO 3 substrates with improved interfacesmoothness. The trilayers are synthesized by ozone-assisted molecular-beam epitaxy. The thickness of the PrBa 2 Cu 3 O 7−x layer is held con-stant at 8 nm, and the thickness of the YBa 2 Cu 3 O 7−x layers is varied from 24 nm to 100 nm. X-ray diffraction measurements show all trilayersto have >97% a-axis content. The rms roughness of the thinnest trilayer is <0.7 nm, and this roughness increases with the thickness of theYBa 2 Cu 3 O 7−x layers. The thickness of the YBa 2 Cu 3 O 7−x layers also affects the transport properties: while all samples exhibit an onset of thesuperconducting transition at and above 85 K, the thinner samples show wider transition widths, ΔT c . High-resolution scanning transmissionelectron microscopy reveals coherent and chemically sharp interfaces and that growth begins with a cubic (Y,Ba)CuO 3−x perovskite phase thattransforms into a-axis oriented YBa 2 Cu 3 O 7−x as the substrate temperature is ramped up.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000630910000001
%R 10.1063/5.0034648
%U https://juser.fz-juelich.de/record/903134