Physics – Condensed Matter – Superconductivity
Scientific paper
2001-09-20
Physics
Condensed Matter
Superconductivity
8 pages, 2 figures, submitted to J. Phys. Condens. Matter
Scientific paper
10.1088/0953-8984/13/44/103
Although quasi-two-dimensional organic superconductors such as $\kappa$-(BEDT-TTF)$_2$Cu(NCS)$_2$ seem to be very clean systems, with apparent quasiparticle mean-free paths of several thousand \AA, the superconducting transition is intrinsically broad (e.g $\sim 1$ K wide for $T_c \approx 10$ K). We propose that this is due to the extreme anisotropy of these materials, which greatly exacerbates the statistical effects of spatial variations in the potential experienced by the quasiparticles. Using a statistical model, we are able to account for the experimental observations. A parameter $\bar{x}$, which characterises the spatial potential variations, may be derived from Shubnikov-de Haas oscillation experiments. Using this value, we are able to predict a transition width which is in good agreement with that observed in MHz penetration-depth measurements on the same sample.
Harrison Neil
Kini AM
Mielke C. H.
Schlueter John
Singleton John
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