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

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2 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)408-410
頁數3
期刊Physica C: Superconductivity and its applications
364-365
DOIs
出版狀態Published - 1 11月 2001

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