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

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

2007-09-20

arxiv.org/abs/0709.3172v1

J. Phys. Soc. Jpn. 76 (2007) 123705.

Physics

Condensed Matter

Superconductivity

4 pages, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.76.123705

We report an impurity effect in the organic superconductor $\kappa$-(ET)$_2$Cu(NCS)$_2$ by substitution of the ET molecule with an analogue, bis(methyleneditio)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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