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Homogeneity in the Microwave Surface Resistance of Large YBa2Cu3O7−δ Superconductor Films Coated with Au

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Abstract

We studied homogeneity in the microwave surface resistance of Au-coated YBa2Cu3O7−δ (Au/YBCO) films. The Au/YBCO film with 4-inches in diameter was prepared in-situ with the thicknesses of 68 nm and 365 nm for the Au layer and the YBa2Cu3O7−δ (YBCO) layer, respectively. We measured the effective surface resistance (RS,eff) of the Au/YBCO film at temperatures of 25 K, 60 K, 70 K, and 77 K, respectively, at 29 different positions on the film. The RS,eff values were analyzed with the finite thicknesses of the Au and the YBCO layers taken into consideration. The local RS,eff values of the Au/YBCO film appeared to be almost uniform at 25 K. Meanwhile significant positional dependences were observed for the RS,eff of the Au/YBCO film at 60 K, 70 K and 77 K, respectively, which seemed to be due to non-uniform local penetration depth (λ) of the YBCO layer rather than due to variations in the local real-part conductivity of the YBCO layer. The observed results could not be attributed to the properties of the Au layer. At temperatures below the critical temperature of YBCO, the observed RS,eff values of the Au/YBCO film were significantly lower than those estimated using the surface resistance of Au and YBCO, which reflected proximity effects of the normal-metal Au layer in contact with the superconducting YBCO layer. Homogeneity in the RS,eff of the Au/YBCO film might be correlated with the distributions in the local λ of the YBCO layer, providing valuable information needed for designing microwave filters.

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References

  1. Hein, M.: High-Temperature-Superconductor Thin Films at Microwave Frequencies, p. 93. Springer, Berlin (1999)

    Google Scholar 

  2. Lee, J.H., Ryu, J.S., Lee, J.H., Lim, J., Moon, S.H., Oh, B., Lee, S.Y.: Measurements of the loss tangent of rutile using an extremely high-Q sapphire-loaded cavity resonator with YBa2Cu3O7-δ endplates. J. Korean Phys. Soc. 39, 1065–1071 (2001)

    CAS  Google Scholar 

  3. Lee, S.Y., Oh, B.: Recent progress in microwave HTS technologies in Korea and Japan. J. Supercond. Novel Magn. 16, 823–831 (2003)

    Article  CAS  Google Scholar 

  4. Ohshima, S.: Recent status of microwave applications in Japan and Asia. Physica C 412–414, 1506–1512 (2004)

    Article  Google Scholar 

  5. Padamsee, H.: The science and technology of superconducting cavities for accelerators. Supercond. Sci. Technol. 14, R28–R51 (2001)

    Article  CAS  Google Scholar 

  6. Lee, S.Y., Lee, J.H., Lim, J., Lee, J., Yun, J.H., Moon, S.H., Oh, B.: Microwave and structural properties of Large YBa2Cu3O7-δ films: a study on the homogeneity. Supercond. Sci. Technol. 14, 921–928 (2001)

    Article  CAS  Google Scholar 

  7. Lee, J.H., Lim, J., Moon, S.H., Yoon, J.H., Choi, Y.H., Oh, B., Lee, S.Y.: Microwave properties of large YBCO films on as-prepared and annealed MgO substrates. IEEE Trans. Appl. Supercond. 13, 2875–2878 (2003)

    Article  CAS  Google Scholar 

  8. Lee, J.H., Ko, Y.B., Lee, S.Y.: Correlation between the microwave surface resistance and the crystal structures of YBa2Cu3O7−δ films on CeO2-buffered sapphire. Supercond. Sci. Technol. 16, 386–391 (2003)

    Article  CAS  Google Scholar 

  9. Zaitsev, A.G., Schneider, R., Geerk, J., Linker, G., Ratzel, F., Smithey, R.: Effective microwave surface resistance of gold-contacted YBa2Cu3O7−x thin films. Appl. Phys. Lett. 75, 4165–4167 (1999)

    Article  CAS  Google Scholar 

  10. Lu, X., Jin, S., Zhang, X., Wei, B., Cao, B.: Influence of the surface gold thin film on HTS filter performance. In 2007 International Conference on Microwave and Millimeter Wave Technology, Builin, pp. 1–3 (2007)

  11. Lee, J.H., Han, H.K., Lee, S.Y.: Effects of the temperature-dependent dielectric constant on the geometrical factors of dielectric resonators and the measurement accuracy in the surface resistance of superconductor films. J. Korean Phys. Soc. 47, 494–500 (2005)

    CAS  Google Scholar 

  12. Lee, S., Yang, W.I., Jung, H.S., Oh, W.-J., Jang, J., Lee, J.-H., Kang, K., Moon, S.H., Yoo, S.-I., Lee, S.Y.: The effects of Gd-free impurity phase on the aging behavior for the microwave surface resistance of Ag-coated GdBa2Cu3O7-δ at cryogenic temperatures. Electron. Mater. Lett. 14, 646–654 (2018)

    Article  CAS  Google Scholar 

  13. Lee, J.H., Yang, W.I., Kim, M.J., Booth, J.C., Leong, K., Schima, S., Rudman, D., Lee, S.Y.: Accurate measurements of the intrinsic surface impedance of thin YBa2Cu3O7−δ films using a modified two-tone resonator method. IEEE Trans. Appl. Supercond. 15, 3700–3705 (2005)

    Article  CAS  Google Scholar 

  14. International Electrotechnical Commission: Intrinsic surface impedance of superconductor films at microwave frequencies, International standard IEC 61788–15 ed. 1 (2011).

  15. Lee, S.Y., Lee, J.H., Yang, W.I., Claassen, J.H.: Microwave properties of sapphire resonators with a gap and their applicability for measurements of the intrinsic surface impedance of thin superconductor films. IEICE Trans. Electron. E89-C, 132–139 (2006)

    Article  Google Scholar 

  16. Jung, H.S., Lee, J.H., Han, H.K., Lee, S.Y.: Noninvasive thickness measurements of metal films through microwave dielectric resonators. Electron. Mater. Lett. 12, 350–355 (2016)

    Article  CAS  Google Scholar 

  17. Klein, N., Chaloupka, H., Müller, G., Orbach, S., Piel, H., Roas, B., Schultz, H., Klein, U., Peiniger, M.: The effective microwave surface impedance of high Tc thin films. J. Appl. Phys. 67, 6940–6945 (1990)

    Article  CAS  Google Scholar 

  18. De Gennes, P.G., Guyon, E.: Superconductivity in “normal” metals. Phys. Lett. 3, 168–169 (1963)

    Article  Google Scholar 

  19. Zaitsev, A.G., Schneider, R., Aidam, R., Linker, G., Ratzel, F., Reiner, J., Smithey, R., Geerk, J.: Effect of a Au contact layer on the microwave performance of YBa2Cu3O7−x thin films. IEEE Trans. Appl. Supercond. 11, 3423–3426 (2001)

    Article  Google Scholar 

  20. Lide, D.R.: Handbook of Chemistry and Physics, 75th edn. CRC Press, New York (1996)

    Google Scholar 

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Acknowledgements

This paper was written as part of Konkuk University’s research support program for its faculty on sabbatical leave in 2017.

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Author notes

  1. Ho Sang Jung

    Present address: SuNAM Co., Ltd., Anseong, Gyunggi-do, 17554, Korea

Authors and Affiliations

  1. Department of Physics, Konkuk University, Seoul, 05029, Korea

    Woo Il Yang, Sungho Lee, Ho Sang Jung & Sang Young Lee

  2. KEPCO Research Institute, Daejeon, 34056, Korea

    Hye-Rim Kim

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  1. Woo Il Yang
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  2. Sungho Lee
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Yang, W.I., Lee, S., Jung, H.S. et al. Homogeneity in the Microwave Surface Resistance of Large YBa2Cu3O7−δ Superconductor Films Coated with Au. Electron. Mater. Lett. 16, 216–223 (2020). https://doi.org/10.1007/s13391-020-00212-5

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