Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 73 > pp. 39-47


By C.-J. Wu, C.-M. Fu, and T.-J. Yang

Full Article PDF (137 KB)

The intrinsic microwave surface impedance for a nearly ferroelectric superconducting film of finite thickness in the dielectriclike response is theoretically investigated. It is based on the electrodynamics of a nearly ferroelectric superconductor that incorporates the Maxwell's equations, the lattice equations for an ionic lattice, and the superconducting London equation as well. It is found that the surface resistance will be enhanced with decreasing the film thickness when the thickness is less than the London penetration depth. However it will begin to resonate as a function of film thickness at the thickness being more than one London penetration depth. The anomalous resonance peaks occur when the thickness equals the even multiple of the London penetration depth. In the frequency-dependent surface resistance, the number of the resonance peaks is strongly dependent on the film thickness, increasing with increasing the thickness. In addition, these peaks are not regularly spaced at a fixed interval. Discussion on this anomaly in the surface resistance will be given.

C.-J. Wu, C.-M. Fu, and T.-J. Yang, "Microwave surface impedance of a nearly ferroelectric superconductor," Progress In Electromagnetics Research, Vol. 73, 39-47, 2007.

1. Shen, Z.-Y., High-Temperature Superconducting Microwave Circuits, Artech House, Norwood, 1994.

2. Wu, C. J., "Transmission and reflection in a periodic superconductor/ dielectric film multilayer structure," J. Electromagnetic Waves and Applications, Vol. 19, 1991-1996, 2005.

3. Pan, V. M., et al., "Microwave impedance of YBa2Cu3O7-δ hightemperature superconductor films in a magnetic field," Low Temp. Phys., Vol. 31, 254-262, 2005.

4. Trunin, M. R., "Temperature dependence of microwave surface impedance in high-Tc single crystals: Experimental and theoretical aspects," J. Supercond., Vol. 11, 381-408, 1998.

5. Liu, S. F. and S. D. Liu, "A novel wideband high-temperature superconducting microstrip antenna," J. Electromagnetic Waves and Applications, Vol. 19, 2073-2079, 2005.

6. Tchernyi, V. V. and E. V. Chensky, "Electromagnetic background for possible magnetic levitation of the superconducting rings of Saturn," J. Electromagnetic Waves and Applications, Vol. 19, 987-995, 2005.

7. Tchernyi, V. V. and A. Yu Pospelov, "Possible electromagnetic nature of the saturns rings: superconductivity and magnetic levitation," Progress In Electromagnetics Research, Vol. 52, 277-299, 2005.

8. Levi, Y., et al., "Evidence for localized high-Tc superconducting regimes on the surface of Na-doped WO3," Europhys. Lett., Vol. 51, 564-570, 2000.

9. Koonce, C. S., et al., "Superconducting transition temperature of semiconducting SrTiO3," Phys. Rev., Vol. 163, 380-390, 1968.

10. Savaguchi, E., et al., "Dielectric constant of Strontium Titanate at low temperature," J. Phys. Soc. Jpn., Vol. 17, 1666-1667, 1962.

11. Birman, J. L. and N. A. Zimbovskaya, "Electrodynamics of nearly ferroelectric superconductors," Phys. Rev. B, Vol. 64, 144506, 2001.

12. Klein, N., et al., "Effective microwave surface impedance of high- Tc thin films," J. Appl. Phys., Vol. 67, 6940-6945, 1990.

13. Wu, C.-J. and T.-Y. Tesng, "Effective microwave surface impedance of superconducting films in the mixed state," IEEE Trans. Magnetics, Vol. 33, 2348-2355, 1997.

© Copyright 2014 EMW Publishing. All Rights Reserved