Effective microwave surface impedance of superconducting films in the mixed state

Chien Jang Wu; Tseung Yuen Tseng

doi:10.1109/20.573854

Effective microwave surface impedance of superconducting films in the mixed state

Chien Jang Wu^*, Tseung Yuen Tseng

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The effective microwave surface impedance of multilayer structures made of high-T_c superconducting films in the mixed state, lossy dielectrics, and normal metals are theoretically calculated. The linear response of the superconductor to a microwave field is analyzed within both transmission line theory and the framework of self-consistent treatment of vortex dynamics reported by Coffey and Clem [18]. The microwave properties are investigated as a function of static field and film thickness for nonresonant structures. The effect of substrate thickness on the resonant phenomenon is carefully studied as well. Numerical results reveal that the substrate resonance in the Meissner state behaves like a parallel lumped-parameter resonantor, while in the vortex state it behaves as a series lumped resonant circuit. The basic distinction suggests that care should be taken in microwave applications when using superconducting films in the vortex state.

Original language	English
Pages (from-to)	2348-2355
Number of pages	8
Journal	IEEE Transactions on Magnetics
Volume	33
Issue number	3
DOIs	https://doi.org/10.1109/20.573854
Publication status	Published - 1997
Externally published	Yes

Keywords

Microwave surface impedance
Mixed state
Resonant phenomenon
Superconducting films

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.573854

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title = "Effective microwave surface impedance of superconducting films in the mixed state",

abstract = "The effective microwave surface impedance of multilayer structures made of high-Tc superconducting films in the mixed state, lossy dielectrics, and normal metals are theoretically calculated. The linear response of the superconductor to a microwave field is analyzed within both transmission line theory and the framework of self-consistent treatment of vortex dynamics reported by Coffey and Clem [18]. The microwave properties are investigated as a function of static field and film thickness for nonresonant structures. The effect of substrate thickness on the resonant phenomenon is carefully studied as well. Numerical results reveal that the substrate resonance in the Meissner state behaves like a parallel lumped-parameter resonantor, while in the vortex state it behaves as a series lumped resonant circuit. The basic distinction suggests that care should be taken in microwave applications when using superconducting films in the vortex state.",

keywords = "Microwave surface impedance, Mixed state, Resonant phenomenon, Superconducting films",

author = "Wu, {Chien Jang} and Tseng, {Tseung Yuen}",

note = "Funding Information: Manuscript received April 30, 1996; revised October 16, 1996. This work was supported by the National Science Council of the Republic of China under Project NSC85-2112-M009-037PH. The authors are with the Department of Electronics Engineering and The Institute of Electronics, National Chiao-Tung University, Hsinchu, Taiwan, R.O.C. Publisher Item Identifier S 0018-9464(97)02087-6.",

year = "1997",

doi = "10.1109/20.573854",

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T1 - Effective microwave surface impedance of superconducting films in the mixed state

AU - Wu, Chien Jang

AU - Tseng, Tseung Yuen

N1 - Funding Information: Manuscript received April 30, 1996; revised October 16, 1996. This work was supported by the National Science Council of the Republic of China under Project NSC85-2112-M009-037PH. The authors are with the Department of Electronics Engineering and The Institute of Electronics, National Chiao-Tung University, Hsinchu, Taiwan, R.O.C. Publisher Item Identifier S 0018-9464(97)02087-6.

PY - 1997

Y1 - 1997

N2 - The effective microwave surface impedance of multilayer structures made of high-Tc superconducting films in the mixed state, lossy dielectrics, and normal metals are theoretically calculated. The linear response of the superconductor to a microwave field is analyzed within both transmission line theory and the framework of self-consistent treatment of vortex dynamics reported by Coffey and Clem [18]. The microwave properties are investigated as a function of static field and film thickness for nonresonant structures. The effect of substrate thickness on the resonant phenomenon is carefully studied as well. Numerical results reveal that the substrate resonance in the Meissner state behaves like a parallel lumped-parameter resonantor, while in the vortex state it behaves as a series lumped resonant circuit. The basic distinction suggests that care should be taken in microwave applications when using superconducting films in the vortex state.

AB - The effective microwave surface impedance of multilayer structures made of high-Tc superconducting films in the mixed state, lossy dielectrics, and normal metals are theoretically calculated. The linear response of the superconductor to a microwave field is analyzed within both transmission line theory and the framework of self-consistent treatment of vortex dynamics reported by Coffey and Clem [18]. The microwave properties are investigated as a function of static field and film thickness for nonresonant structures. The effect of substrate thickness on the resonant phenomenon is carefully studied as well. Numerical results reveal that the substrate resonance in the Meissner state behaves like a parallel lumped-parameter resonantor, while in the vortex state it behaves as a series lumped resonant circuit. The basic distinction suggests that care should be taken in microwave applications when using superconducting films in the vortex state.

KW - Microwave surface impedance

KW - Mixed state

KW - Resonant phenomenon

KW - Superconducting films

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Effective microwave surface impedance of superconducting films in the mixed state

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Keywords

ASJC Scopus subject areas

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