TY  - JOUR
AU  - Suyolcu, Y. Eren
AU  - Sun, Jiaxin
AU  - Goodge, Berit H.
AU  - Park, Jisung
AU  - Schubert, Jürgen
AU  - Kourkoutis, Lena F.
AU  - Schlom, Darrell G.
TI  - 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
JO  - APL materials
VL  - 9
IS  - 2
SN  - 2166-532X
CY  - Melville, NY
PB  - AIP Publ.
M1  - FZJ-2021-04858
SP  - 021117 -
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000630910000001
DO  - DOI:10.1063/5.0034648
UR  - https://juser.fz-juelich.de/record/903134
ER  -