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We report an impurity effect in the organic superconductor$\kappa$-(ET)$_2$Cu(NCS)$_2$ by substitution of the ET molecule with ananalogue, bis(methyleneditio)tetrathiafulvalene (MT). The superconductingtransition temperature decreases with increasing substitution. The in-planemagnetic penetration depth is enhanced with substitution, which isquantitatively attributed to the decrease in the in-plane mean free path. Theenhancement of the penetration depth can also explain the reduction of theeffective pinning in terms of the condensation energy.

Impurity Effect on Superconducting Properties in Molecular Substituted Organic Superconductor $\kappa$-(ET)$_2$Cu(NCS)$_2$