Laser wavelength dependent properties of YBa2Cu3O7−&dgr;thin films deposited by laser ablation
作者:
G. Koren,
A. Gupta,
R. J. Baseman,
M. I. Lutwyche,
R. B. Laibowitz,
期刊:
Applied Physics Letters
(AIP Available online 1989)
卷期:
Volume 55,
issue 23
页码: 2450-2452
ISSN:0003-6951
年代: 1989
DOI:10.1063/1.101999
出版商: AIP
数据来源: AIP
摘要:
YBa2Cu3O7−&dgr;thin films were deposited onto (100) SrTiO3substrates using 1064, 532, 355, 248, and 193 nm laser ablation. Transport measurements show lower normal‐state resistivities and higher critical currents in films deposited by the shorter wavelength lasers. The surface morphology of the films was rough with large particulates when the 1064 nm laser was used whereas much smoother surfaces with fewer and smaller particulates were obtained with the UV lasers. It is suggested that the better film quality obtained when the UV lasers are used is due to a small absorption depth of the UV photons in the ceramic target and to higher absorption by the ablated fragments. This leads to smaller ablated species and further fragmentation in the hotter plume and, therefore, to smoother and denser films.
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