Universal relationship between the penetration depth and the normal-state conductivity in YBaCuO
A. Pimenov, A. Loidl, B. Schey, B. Stritzker, G. Jakob, H. Adrian, A. V. Pronin, Yu. G. Goncharov
Abstract
The absolute values of the conductivity in the normal state sigman and of the low temperature penetration depths lambda(0) were measured for a number of different samples of the YBaCuO family. We found a striking correlation between sigman and 1/lambda2, regardless of doping, oxygen reduction or defects, thus providing a simple method to predict the superconducting penetration depth and to have an estimate of the sample quality by measuring the normal-state conductivity.
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