Suppression of superconductivity by non-magnetic disorder in organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu(NCS)$_{2}$

Details Suppression of superconductivity by non-magnetic disorder in organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu(NCS)$_{2}$ Suppression of superconductivity by non-magnetic disorder in organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu(NCS)$_{2}$

2010-04-26

arxiv.org/abs/1004.4406v2

J. Phys. Soc. Jpn. 80, 104703-1-10 (2011)

Physics

Condensed Matter

Superconductivity

11 pages, 6 figures

Scientific paper

10.1143/JPSJ.80.104703

The suppression of superconductivity by nonmagnetic disorder is investigated systematically in the organic superconductor $\kappa$-(BEDT-TTF)$_2$Cu(NCS)$_2$. We introduce a nonmagnetic disorder arising from molecule substitution in part with deuterated BEDT-TTF or BMDT-TTF for BEDT-TTF molecules and molecular defects introduced by X-ray irradiation. A quantitative evaluation of the scattering time $\tau_{\rm dHvA}$ is carried out by de Haas-van Alphen (dHvA) effect measurement. A large reduction in $T_{\rm c}$ with a linear dependence on $1/\tau_{\rm dHvA}$ is found in the small-disorder region below $1/\tau_{\rm dHvA} \simeq$ 1 $\times$ 10$^{12}$ s$^{-1}$ in both the BMDT-TTF molecule-substituted and X-ray-irradiated samples. The observed linear relation between $T_{\rm c}$ and $1/\tau_{\rm dHvA}$ is in agreement with the Abrikosov-Gorkov (AG) formula, at least in the small-disorder region. This observation is reasonably consistent with the unconventional superconductivity proposed thus far for the present organic superconductor. A deviation from the AG formula, however, is observed in the large-disorder region above $1/\tau_{\rm dHvA} \simeq$ 1 $\times$ 10$^{12}$ s$^{-1}$, which reproduces the previous transport study (J. G. Analytis {\it et al.}: Phys. Rev. Lett. {\bf 96} (2006) 177002). We present some interpretations of this deviation from the viewpoints of superconductivity and the inherent difficulties in the evaluation of scattering time.

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