Universal relationship between the penetration depth and the normal-state conductivity in YBaCuO

The absolute values of the conductivity in the normal state $\sigma _{\rm n}$ 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 $\sigma _{\rm n}$ and $\lambda ^{-2}\,$ regardless o...

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Bibliographic Details
Published in:Europhysics letters 1999-10, Vol.48 (1), p.73-78
Main Authors: Pimenov, A, Loidl, A, Schey, B, Stritzker, B, Jakob, G, Adrian, H, Pronin, A. V, Goncharov, Yu. G
Format: Article
Language:English
Subjects:
74.25.-q
74.25.Fy
74.76.Bz
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Summary:The absolute values of the conductivity in the normal state $\sigma _{\rm n}$ 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 $\sigma _{\rm n}$ and $\lambda ^{-2}\,$ 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.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i1999-00116-1