Determination of the doping dependence of the penetration depth using YBCO microstrip ring resonators

Y. S. Gou*, H. K. Zeng, Jenh-Yih Juang, Jiunn-Yuan Lin, Kaung-Hsiung Wu, T. M. Uen, H. C. Li

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

We present a method to determine the temperature dependent London penetration depth measured by a microstrip ring resonator for YBCO thin films with various oxygen contents. It allows us to get the following important results of the superconducting properties in the underdoped cuprate superconductors. With increasing δ (e.g. δ = 0.05, 0.2, and 0.4), the superfluid density, λ2(5K)/λ2(T), is linear in the low temperature range (T < Tc/3), and the slope changes with increasing oxygen deficiency. After the temperature normalization with respect to the critical temperature, the temperature dependence of the superfluid density is shown to be independent of doping concentration. Moreover the maximum energy gap can be estimated from the model of the d-wave pairing. We found that the ratio Δ/Tc is nearly fixed value, 3.0 ± 0.4.

Original languageEnglish
Pages (from-to)408-410
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume364-365
DOIs
StatePublished - 1 Nov 2001

Keywords

  • Microstrip ring resonator
  • Penetration depth
  • YBCO

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