EFFECT OF OXYGEN PLASMA GENERATED BY DIFFERENT MICROWAVE MODES ON NdBa2Cu3O6+d SUPERCONDUCTOR: STRUCTURE AND IR STUDIES

The effect of longitudinal and transverse modes of oxygen plasma generated by microwave source with frequency 2.45 GHz has been used to characterize polycrystalline samples of NdBa2Cu3O6+d (Nd-123) high Tc-superconductor. For this purpose authors have developed a simple oxidation technique to invest...

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Bibliographic Details
Published in:The Journal of physics and chemistry of solids 2003-01, Vol.64 (8), p.1405-1411
Main Authors: Ismail, L Z, Youssif, M I, Abdel Moneim, H M
Format: Article
Language:English
Online Access:Get full text
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Summary:The effect of longitudinal and transverse modes of oxygen plasma generated by microwave source with frequency 2.45 GHz has been used to characterize polycrystalline samples of NdBa2Cu3O6+d (Nd-123) high Tc-superconductor. For this purpose authors have developed a simple oxidation technique to investigate the effect of different modes on the appearance of superconductivity in Nd-123. Main results show that the mode of microwave plasma and time of exposure can control the local arrangement of oxygen vacancies in CuOd basal plane. Samples exposed to the transverse mode reveals a well ordered orthorhombic phase transition while the longitudinal modes caused the samples to have a non-superconducting tetragonal structure for all of the exposure time. The Tc vs. d curve does not show the typical 60 K plateau corresponding to the ortho-II phase. The IR spectrum show bands at shorter wavelengths which corresponding to the metal oxides. 16 refs.
ISSN:0022-3697