Low dimensional conductors

A particular subgroup of these low-dimensional conductors are the charge transfer complexes between dithiolenes and organic donor species such as TTF and related compounds. Here, nonintegral charge transfer is often seen as the reason for high conductivity down to low temperatures. 

D. Jerome and L. G. Caron (Eds.), Low Dimensional Conductors and Superconductors, NATO Advanced Study Institute, Series B, Vol. 155, (Plenum, New York 1987) J.T. Devreese (Ed.), Highly Conducting One-Dimensional Solids, (Plenum, New York/London 1979) G. Griiner, Density Waves in Solids (Addison-Wesley, London, 1994)... 

V.Ya.Krivnov, A.A.Ovchinnikov and V.O.Cheranovskii, Research Reports in Physics. Electron-electron correlation effects in low-dimensional conductors and superconductors, Springer-Verlag, Heidelberg 1991. 

Phase transitions. Low-dimensional conductors undergo several types of specific structural phase transitions, such as the Peierls distortion (electron-phonon coupling), the spin-Peierls distortion (spin-phonon coupling), anion-ordering transitions, and so on. These first have to be detected and then measured and understood. However, the foregoing distortions may be very small and difficult to observe, and up to now, only a few lattice distortions have been fully measured and described. 

The crystallography of organic low-dimensional conductors is, in many ways, similar to that of other organic materials, but nevertheless has some specific aspects ... 

One of the great advantages of the fixed-film fixed-crystal technique is that even with a conventional x-ray tube, it makes possible the observation of extremely weak diffuse lines or satellites. It is thus an outstanding tool for the study of low-dimensional conductors, but some experience is required to read the patterns. To improve the accuracy of the measurements (e.g., extraction of accurate wave vector coordinates) a microdensitometer reading is often necessary (see, e.g., Ref. 119). Film results can also be used as a starting point for counter measurements (see, e.g., Ref. 74). 

C. S. Jacobsen, in Low Dimensional Conductors and Superconductors, NATO ASI Series (D. Jerome and L. G. Caron, eds.), Plenum Press, New York, 1987. 

The oxidized material also has its Fermi level in a band, i.e., there is a zero band gap between filled and empty levels. The unoxidized platino-cyanides have a substantial gap—they arc semiconductors or insulators. The oxidized materials are good low-dimensional conductors, which is a substantial part of what makes them interesting to physicists.14... 

See, for example Proc. of the International Conference on Low Dimensional Conductors and Superconductors, Les Arcs, 1982 [J. Physique Colloq. 44, C3 (1983)] and Proc. of the International Conference on the Physics and Chemistry of Low-Dimensional Synthetic Metals (ICSM 84), Abano Terme, 1984 [Mol. Cryst. Liq. Cryst. 119, (1985)]... 

D. Jdrome, L.G. Caron, Eds. Low-Dimensional Conductors and Superconductors NATO Advanced Science Institutes Series B155 (Plenum New York, 1987). 

A.A. Ovchinnikov, I.I. Ukrainskii, Eds. Low-Dimensional Conductors and Superconductors, Springer Research Reports in Physics (Springer Berlin, 1991). 

Another interesting piece of work is concerned with metal fcis(dithiolene) complexes substituted peripherally with four or eight aliphatic chains ((70) R = OCJ32 +i> R = H R = R = OC H2/,+i). Structurally similar to the metal /3-diketonate complexes discussed above, it was expected that such complexes would exhibit columnar mesophases on the basis of their disk-like shape. Furthermore, combined with their vr-acceptor properties, such discogens could find potential applications as low-dimensional conductors. The complexes were synthesized in a one-pot procedure the appropriately substituted benzoin or benzil (a-diketone derivative) was treated with P4S10, and complexation was carried out in situ with the metal chloride salt. 

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