Evaluation of Magnetic Penetration Depth and Surface Resistance of Superconducting Thin Films using Coplanar Waveguides

K. Yoshida, K. Watanabe, Takanobu Kiss, Keiji Enpuku

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We have proposed a method to evaluate the magnetic penetration depth and the surface resistance of superconducting thin films from the kinetic inductance measurement using coplanar waveguides. The method utilizes the coplanar waveguide resonator where the temperature dependence of the resonant frequency due to the kinetic inductance is measured. Comparison between the observed data and an analytical expression using a conformal mapping technique gives the value of the magneic penetration depth. The magnetic penetration depth of NbN thin films obtained in this way is shown to be in excellent agreement with that estimated from the dirty limit theory using resistivity and critical temperature. By applying this method to a YBaCuO resonator, we obtained the magnetic penetraion depth A (0)=260 nm for a c-axis oriented film. Using the two-fluid model it is also shown that the surface resistance of the film can be evaluated from the quality factor and the kinetic inductance. We obtained the residual surface resistance Rs(0)=20µΩ at a frequency of 3.8 GHz.

Original languageEnglish
Pages (from-to)1979-1982
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume5
Issue number2
DOIs
Publication statusPublished - Jan 1 1995
Externally publishedYes

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Penetration depth (superconductivity)
Surface resistance
Superconducting films
Coplanar waveguides
penetration
inductance
waveguides
Inductance
Kinetics
evaluation
Resonators
Inductance measurement
thin films
Conformal mapping
kinetics
resonators
two fluid models
conformal mapping
Natural frequencies
resonant frequencies

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Evaluation of Magnetic Penetration Depth and Surface Resistance of Superconducting Thin Films using Coplanar Waveguides. / Yoshida, K.; Watanabe, K.; Kiss, Takanobu; Enpuku, Keiji.

In: IEEE Transactions on Applied Superconductivity, Vol. 5, No. 2, 01.01.1995, p. 1979-1982.

Research output: Contribution to journalArticle

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