Preparation of extremely smooth YBa2Cu3O7−δ thin films on the annealed MgO substrates

Autor:	Min Ye, Marie-Paule Delplancke, René Winand, Jeannot Schroeder, Robert Deltour
Rok vydání:	1997
Předmět:	Materials science Scanning electron microscope Transition temperature Nucleation Analytical chemistry Mineralogy General Chemistry Surface finish Condensed Matter Physics Epitaxy Cavity magnetron Materials Chemistry Surface roughness Thin film
Zdroj:	Solid State Communications. 103:645-648
ISSN:	0038-1098
DOI:	10.1016/s0038-1098(97)00239-1
Popis:	Extremely smooth YBa2Cu3O7−δ thin films (Tc = 88 K and a Jc ≥ 2 × 106 A cm−2 at 77 K) were deposited on annealed (1 0 0) MgO substrates. X-ray diffractions of these films reveal that they are c-axis oriented with a high quality of epitaxy. A flat surface free of outgrowths is observed by scanning electron microscopy. Atomic force microscopy study shows that the average surface roughness of these films is less than 1 nm. It is found that the surface steps, induced by the thermal annealing on MgO substrates are essential for the preparation of epitaxial YBa2Cu3O7−δ thin films with an extremely smooth surface. These steps are interpreted as the preferential nucleation and rapid growth sites which lead to a controlled growth and a smooth surface.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bac47d2df50da32a9e163bb62e457443 https://doi.org/10.1016/s0038-1098(97)00239-1 Zobrazit plný text záznamu Full Text from ScienceDirect