Organic coherence length

Ito H, Watanabe M, Nogami Y, Ishiguro T, Komatsu T, Saito G, Hosoito N (1991) Magnetic determination of Ginzburg-Landau coherence length for organic superconductor /c-(BEDT-TTF)2X (X = Cu(NCS)2, Cu[N(CN)2]Br) effect of isotope substitution. J Phys Soc Jpn 60 ... 

The coherence length in the organic superconductors is of the order of a lattice constant (as it is for the ceramic oxide superconductors). The organic... 

Recent structural investigations give evidence of a situation too complicated to be described in detail here. It now appears that both EBI and EBII may be amorphous, but that their local orders differ. EBI is always amorphous, and ESI partly crystalline, whereas EBII may be amorphous or partly crystalline. In all cases the amorphous region s local order is very reminiscent of the organization of the crystalline regions of the same material. Since coherence lengths in the crystallites are Lp = 40 to 50 A, or about five repeat units, these similarities are quite understandable. These relations in local order explain why I <- II class interconversion does not occur until the material is dissolved and reprecipitated, thus destroying the local order. 

The coherence length in the organic superconductors is of the order of a lattice constant (as it is for the ceramic oxide superconductors). The organic superconductors are of type II (they have two critical fields). The dimensionality is between 1 and 2 (it is 3-D for the fullerides). For organic superconductors, the isotope effect results are unclear it is not certain which phonon modes are important for the superconductivity. 

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