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A statistical model for the intrinsically broad superconducting to normal transition in quasi-two-dimensional crystalline organic metals | | J. Singleton
; N. Harrison
; C.H. Mielke
; J. Schlueter
; AM Kini
; | | Date: |
20 Sep 2001 | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | 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 $ar{x}$, 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. | | Source: | arXiv, cond-mat/0109363 | | Services: | Forum | Review | PDF | Favorites | |
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