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We report the in-plane penetration depth $\lambda_{\parallel}$ of singlecrystals $\kappa$-(BEDT-TTF)$_2X$ ($X=$ Cu(NCS)$_2$ and Cu[N(CN)$_2$]Br) bymeans of the reversible magnetization measurements under the control ofcooling-rate. In $X$ = Cu(NCS)$_2$, $\lambda_{\parallel}(0)$ as anextrapolation toward $T$ = 0 K does not change by the cooling-rate within theexperimental accuracy, while $T_{\textrm{c}}$ is slightly reduced. On the otherhand, in $X$ = Cu[N(CN)$_2$]Br, $\lambda_{\parallel}(0)$ indicates a distinctincrease by cooling faster. The different behavior of $\lambda_{\parallel}(0)$on cooling-rate between the two salts is quantitatively explained in terms ofthe local-clean approximation (London model), considering that the former saltbelongs to the very clean system and the later the moderate clean one. The goodagreement with this model demonstrates that disorders of ethylene-group inBEDT-TTF introduced by cooling faster increase theelectron(quasiparticle)-scattering, resulting in shorter mean free path.Comment: 8 pages, 9 figure

journal of the physical society of japan

Impurity Effect on the In-plane Penetration Depth of the Organic Superconductors κ-(BEDT-TTF)2X(X= Cu(NCS)2and Cu[N(CN)2]Br)