Atomically Defined Rare-Earth Scandate Crystal Surfaces

作者：Kleibeuker Josee E^*; Koster Gertjan; Siemons Wolter; Dubbink David; Kuiper Bouwe; Blok Jeroen L; Yang Chan Ho; Ravichandran Jayakanth; Ramesh Ramamoorthy; ten Elshof Johan E; Blank Dave H A; Rijnders Guus

来源：Advanced Functional Materials, 2010, 20(20): 3490-3496.

DOI：10.1002/adfm.201000889

The fabrication of well-defined, atomically sharp substrate surfaces over a wide range of lattice parameters is reported, which is crucial for atomically regulated epitaxial growth of complex oxide heterostructures. By applying a framework for controlled selective wet etching of complex oxides on the stable rare-earth scandates (REScO(3)), a(pseudocubic) = 0.394-0.404 nm, the large chemical sensitivity of REScO(3) to basic solutions is exploited, which results in reproducible, single-terminated surfaces. Time-of-flight mass-spectroscopy measurements show that after wet etching the surfaces are predominantly ScO(2)-terminated. Moreover, the morphology study of SrRuO(3) thin-film growth gives no evidence for mixed termination. Therefore, it is concluded that the REScO(3) surfaces are completely ScO(2)-terminated.

• 出版日期2010-10-22