Linear Temperature Variation of the Penetration Depth in YBCO Thin Films

Details Linear Temperature Variation of the Penetration Depth in YBCO Thin Films Linear Temperature Variation of the Penetration Depth in YBCO Thin Films

1995-04-14

arxiv.org/abs/cond-mat/9504062v1

Physics

Condensed Matter

12 pages, revtex, 4 uuencoded figures

Scientific paper

10.1209/epl/i1996-00314-9

We have measured the penetration depth $\lambda(T)$ on $\rm YBa_{2}Cu_{3}O_{7}$ thin films from transmission at 120, 330 and 510~GHz, between 5 and 50~K. Our data yield simultaneously the absolute value and the temperature dependence of $\lambda(T)$. In high quality films $\lambda(T)$ exhibits the same linear temperature dependence as single crystals, showing its intrinsic nature, and $\lambda(0)=1750\,{\rm \AA}$. In a lower quality one, the more usual $T^2$ dependence is found, and $\lambda(0)=3600\,{\rm \AA}$. This suggests that the $T^2$ variation is of extrinsic origin. Our results put the $d$-wave like interpretation in a much better position.

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