Description of the nonlinear behavior of superconductors using a complex conductivity
| Autor: | Donald C. DeGroot, James C. Booth, S.A. Schima |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Superconductivity
High-temperature superconductivity Materials science Condensed Matter Physics Network analyzer (electrical) Electronic Optical and Magnetic Materials Computational physics law.invention Nonlinear system Resonator law Transmission line Condensed Matter::Superconductivity High harmonic generation Electrical and Electronic Engineering Intermodulation |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 13:315-319 |
| ISSN: | 2378-7074 1051-8223 |
| DOI: | 10.1109/tasc.2003.813718 |
| Popis: | The origin of the detrimental nonlinear response in high T/sub c/ superconductor (HTS) microwave devices is currently not well understood. In order to help elucidate the origin of these nonlinear effects, we have developed a description of the nonlinear response in superconductors in terms of a current-dependent complex conductivity. We demonstrate that such a treatment can consistently describe the results of power-dependent surface impedance measurements in resonator geometries as well as harmonic generation and intermodulation distortion effects in transmission line geometries. This approach yields a device-independent quantity that describes the nonlinear response of the superconducting material itself, which is suitable for comparisons of different materials and for material optimization. A further benefit of this description of nonlinear effects is that the relative importance of the nonlinear resistive and inductive components of a superconductor can be examined. We use this approach to predict the phase of the nonlinear response in HTS planar transmission lines, and compare our predictions with new phase-sensitive measurements made using a nonlinear vector network analyzer. |
| Databáze: | OpenAIRE |
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