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High-frequency dissipation in high-Tc superconductors at low magnetic field

✍ Scribed by B. Czyżak

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
633 KB
Volume
243
Category
Article
ISSN
0921-4534

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✦ Synopsis

The complex mechanism of high-frequency dissipation in high-temperature superconductors is discussed. The dissipation is due to the presence of thermally excited carriers, vortex motion, and the existence of inter-and intragrain Josephson junctions in superconducting material. At a low magnetic field, the superconducting sample can be modeled as a network of resistively shunted Josephson junctions. A comparison between the single-and double-contact model is presented. Considering the properties of the network of resistively shunted, symmetric double contracts irradiated by the microwaves, one obtains a consistent description of the high-frequency dissipation in ceramics and single crystals at a low magnetic field. The different distribution of effective areas of junctions and superconducting loops explains a variety of the magnetic field dependences of high-frequency dissipation observed in ceramics of different porosity, texture, and grain size, as well as in single crystals. The proposed model allows one to distinguish the extrinsic and intrinsic high-frequency properties of high-temperature superconductors.

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