General solution for the complex frequency shift in microwave measurements of thin films

Peligrad, D.-N. and Nebendahl, B. and Mehring, M. and Dulčić, Antonije and Požek, Miroslav and Paar, Dalibor (2001) General solution for the complex frequency shift in microwave measurements of thin films. Physical Review B, 64 (22). pp. 224504-12. ISSN 1098-0121

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Perturbation of a microwave cavity by a small sample with variable dielectric, magnetic, or conducting properties is considered. The complex frequency shift is derived in terms of a volume integral, or equivalently, in terms of a surface integral. These are used to obtain a general formula for thin films in the microwave electric field maximum. The complex frequency shift depends on the depolarization factor of the film and on its thickness in a nontrivial way. The previously known expressions for the complex frequency shift are shown to be good approximations of the present solution in the low and high conductivity limits. Our formula is applied to calculate the signal shapes in superconducting films of various geometric parameters and conductivities. It is shown that a diversity of signal shapes can result, and experimental support of those shapes is provided. The role of the dielectric substrate on which the thin film is grown is simply reduced to an asymmetry effect.

Item Type: Article
Keywords: superconducting thin films, microwave measurement, surface conductivity, high-frequency effects
Date: November 2001
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2001) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119201, 119225
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 23 May 2014 07:54
Last Modified: 23 May 2014 07:54

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