General solution for the complex frequency shift in microwave measurements of thin films (CROSBI ID 94759)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Peligrad, D.-N. ; Nebendahl, B. ; Mehring, M. ; Dulčić, Antonije ; Požek, Miroslav ; Paar, Dalibor
engleski
General solution for the complex frequency shift in microwave measurements of thin films
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.
superconducting thin films ; microwave measurement ; surface conductivity ; high-frequency effects
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Podaci o izdanju
64 (22)
2001.
224504
12
objavljeno
1098-0121
1550-235X
10.1103/PhysRevB.64.224504