2007 年 76 巻 12 号 p. 123705
We report an impurity effect in the organic superconductor κ-(ET)2Cu(NCS)2 by substitution of the ET molecule with an analogue, bis(methylenedithio)tetrathiafulvalene (MT). The superconducting transition temperature decreases with increasing substitution. The in-plane magnetic penetration depth is enhanced with substitution, which is quantitatively attributed to the decrease in the in-plane mean free path. The enhancement of the penetration depth can also explain the reduction of the effective pinning in terms of the condensation energy.
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