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Effect of post-annealing on thin YBCO | films deposited from a nanocrystalline target

Pulsed laser deposition is used to ablate thin superconducting YBCO films on SrTiO3 substrates. The most important parameters of thin superconducting films are high critical current density, ability to stand magnetic fields and smoothness of surfaces. Smoothness is important in fabrication of layere... Full description

Main Author: Huhtinen, H.
Contributors: Lähderanta, E. | Author
Paturi, P. | Author
Contained in: Journal of Low Temperature Physics Dordrecht : Springer Science + Business Media B.V Vol. 117, No. 3/4 (1999), p. 795-799
Journal Title: Journal of Low Temperature Physics
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Links: Volltext (dx.doi.org)
ISSN: 1573-7357
Additional Keywords: OriginalPaper
DOI: 10.1023/A:1022517916782
Language: English
Physical Description: Online-Ressource
ID (e.g. DOI, URN): 10.1023/A:1022517916782
A:1022517916782
PPN (Catalogue-ID): SPR030924189
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Internes Format
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520 |a Pulsed laser deposition is used to ablate thin superconducting YBCO films on SrTiO3 substrates. The most important parameters of thin superconducting films are high critical current density, ability to stand magnetic fields and smoothness of surfaces. Smoothness is important in fabrication of layered structures and for research of basic properties of thin superconducting structures. The target sintered from YBCO nanopowder is a promising material for making films which meet most of the requirements above. Investigations by AFM show that our target has grains about one order of magnitude smaller than usual grain size of commercial targets. At optimal deposition parameters, the oxygen pressure of 0.4 torr in the chamber and the substrate temperature 725°C, films with T c= 90 K, J c=8 × 106 A/cm2(77 K) and RMS surface roughness= 1.5 nm are obtained. Thermal annealing of the deposited films for18 h at900° C further increases the value of J c. 
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700 1 |a Paturi, P.  |e verfasserin  |4 aut 
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