Low temperature penetration depth and the effect of quasi-particle scattering measured by millimeter wave transmission in YBaCuO thin films

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dc.creatorDjordjevic, S.
dc.creatorde Vaulchier, L. A.
dc.creatorBontemps, N.
dc.creatorVieren, J. P.
dc.creatorGuldner, Y.
dc.creatorMoffat, S.
dc.creatorPreston, J.
dc.creatorCastel, X.
dc.creatorGuilloux-Viry, M.
dc.creatorPerrin, A.
dc.date1998-01-23
dc.date.accessioned2026-07-25T23:39:27Z
dc.descriptionMeasurement of the penetration depth as a function of temperature using millimeter wave transmission in the range 130-500GHz are reported for three YBCO thin films. The experiment provides the absolute value for the penetration depth at low temperature: the derivation from the transmission data and the experimental uncertainty are discussed. We find a zero temperature penetration depth of 199+/-20nm, 218+/-20nm and 218+/-20nm, for YBCO-50nm/LaAlO3 (pristine), YBCO-130nm/MgO and YBCO-50nm/LaAlO3 (irradiated) respectively. The penetration depth exhibits a different behavior for the three films. In the pristine sample, it shows a clear temperature and frequency dependence, namely the temperature dependence is consistent with a linear variation, whose slope decreases with frequency: this is considered as an evidence for the scattering rate being of the order of the measuring frequency. A two fluids analysis yields 1.7 10^{12} s^{-1}. In the two other samples, the penetration depth does not display any frequency dependence, suggesting a significantly larger scattering rate. The temperature dependence is different in these latter samples. It is consistent with a linear variation for the YBCO/MgO sample, not for the YBCO/LaAlO3 irradiated one, which exhibits a T^2 dependence up to 40K. We have compared our data to the predictions of the d-wave model incorporating resonant scattering and we do not find a satisfactory agreement. However, the large value of the penetration depth at zero Kelvin in the pristine sample is a puzzle and sheds some doubt on a straightforward comparison with the theory of data from thin films, considered as dirty d-wave superconductors.
dc.description11 pages, 10 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/9801244
dc.identifierhttp://arxiv.org/abs/cond-mat/9801244
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/100356
dc.subjectSuperconductivity
dc.titleLow temperature penetration depth and the effect of quasi-particle scattering measured by millimeter wave transmission in YBaCuO thin films
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