Microwave properties of a Y0.7Ca0.3Ba 2Cu3O7-δ microstrip ring resonator with various hole concentrations

L. S. Lai*, Jenh-Yih Juang, Kaung-Hsiung Wu, T. M. Uen, Jiunn-Yuan Lin, Y. S. Gou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Superconducting ring resonator with a Y0.7Ca 0.3Ba2Cu3O7-δ ground plane was fabricated by using Y0.7Ca0.3Ba2Cu 3O7-δ thin film deposited on both sides of a LaAlO3 (LAO) substrate. The resonator exhibits a high quality factor Q > 104 at T < 30 K, and from empirical relation, T c/Tc,max = 1 - 82.6(p - 0.16)2, we obtained the hole concentration p. By controlling the oxygen contents of the ring resonator, the hole concentration p was controlled from 0.218 to 0.088, determined by the empirical relation, in the same film. The temperature dependence of the resonance frequency, f(T), was then systematically studied. By using Chang's inductive formula and taking a functional form (λ(5K)/λ(T)) 2 = 1 - (T/Tc)2 at T < 0.6Tc, the London penetration depths λ(5K) for various oxygen contents at 5K were obtained, respectively. Finally, it allows us to test the Uemura relation 1/λ2(5K) ∝ Tc from the over- to the underdoped regime in the same sample.

Original languageEnglish
Pages (from-to)133-138
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue number3
StatePublished - 15 Oct 2004


  • Microwave ring resonators
  • Penetration depth
  • YCaBa CuO

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