Intermodulation Distortion in Epitaxial Y-Ba-Cu-O Thick Films and Multilayers

Title
Intermodulation Distortion in Epitaxial Y-Ba-Cu-O Thick Films and Multilayers
Authors
장호원최경진C. M. FolkmanD. E. OatesC. B. Eom
Keywords
Intermodulation distortion; pulsed-laser deposition
Issue Date
2009-06
Publisher
IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee
Citation
VOL 19, NO 3, 2855-2858
Abstract
We report intermodulation distortion (IMD) in highquality epitaxial YBa2Cu3O7-δ (YBCO) thick films and multilayers prepared by pulsed-laser deposition (PLD) using multiple targets. Two sets of films were prepared: single-layer and multilayer YBCO films in which a 20-nm-thick CeO2 inter layer is inserted between every 100-nm-thick YBCO layer. With increasing YBCO thickness from 200 nm to 1200 nm, single-layer films exhibited improvement of IMD, whereas multilayer films showed degradation of IMD. Similarly, YBCO crystalline quality in single-layer films was improved with increasing the thickness, while that in multi-layers films degraded. These results suggest that there is a strong correlation between crystalline quality and IMD for YBCO films. The comparison of experimental data with the theory of IMD suggests that improving crystalline quality is essential for YBCO films with thickness greater than 1 ㎛ to achieve an intrinsic nonlinear behavior. PLD using multiple targets is a very useful method to grow thick YBCO films with high crystalline quality and low IMD.
URI
http://pubs.kist.re.kr/handle/201004/35695
ISSN
1051-8223
Appears in Collections:
KIST Publication > Article
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