Interaction between microwaves and vortices: Influence of heavy ion-induced defects

We report experimental results on the external static magnetic field dependence of the kinetic inductance of YBaCuO microstrip resonators, through microwave resonance frequency measurements. We interpret our data in terms of granularity to relate the resonance frequency variations to grain-pinned vo...

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Bibliographic Details
Published in:Applied superconductivity 1996-03, Vol.4 (3), p.143-149
Main Authors: Trotel, A., Lederer, P., Lavigne, B., Chambonnet, D., Pyée, M., Costantini, J.M.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
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Summary:We report experimental results on the external static magnetic field dependence of the kinetic inductance of YBaCuO microstrip resonators, through microwave resonance frequency measurements. We interpret our data in terms of granularity to relate the resonance frequency variations to grain-pinned vortices or grain-boundary vortices. In order to modify the pinning characteristics of the material, the YBaCuO films were irradiated with 70 MeV 63Cu ions, which are able to produce amorphous ionization tracks in this material. We have studied the influence of these columnar defects on the frequency shifts observed in the resonator. The results show that columnar defects may act as very strong pinning centers inside superconducting grains, but they have little effects on vortices trapped in intergranular regions.
ISSN:0964-1807
1879-1530
DOI:10.1016/S0964-1807(96)00020-8