- Autor(in)
- Sponsor(in)
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Deutschland. Bundesministerium für Forschung und Technologie
- Referenz
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10 V. B. Ginodmann, A. v. Gudenko, P. A. Kononovich, V. N. Laukhin, I. F. Shchegolev, Sov. Phys. JETP 67 (1988) 1055
11 W. Kang, S. Tomic, J. R. Cooper, D. Jerome, Phys. Rev. B 41 (1990) 4862;
12 Th. Schimmel, W. Rieß, G. Denninger, M. Schwoerer, Ber. Bunsenges. Phys. Chem. 91 (1987) 901
13 U. Köbler, J. Gmeiner, E. Dormann, J. Magn. Magn. Mat. 69 (1987) 189
14 G. Sachs, W. Stöcklein, B. Bail, E. Dormann, M. Schwoerer, Chem. Phys Lett. 89 (1982) 179;
15 P. A. Lee, T. M. Rice, P. W. Anderson, Phys. Rev. Lett. 31 (1973) 462
16 D. C. Johnston, Phys. Rev. Lett. 52 (1984) 2049;
17 G. Sachs, E. Dormann, M. Schwoerer, Solid State Comm. 53 (1985) 73
18 M. J. Rice, S. Strässler, Solid State Commun. 13 (1973) 125
19 H. J. Schulz in: D. Jerome, L. G. Caron (eds.), Low-Dimensional Conductors and Superconductors, Plenum, New York 1987, p. 95
1 R. E. Peierls, Quantum Theory of Solids, Clarendon, Oxford 1955, p. 108
20 G. Grüner, Phys. Rep. 119 (1985) 117
21 K. Carneiro in: P. Monceau (ed.), Electronic Properties of Inorganic Quasi-One-Dimensional Compounds II, Reidel, Dordrecht 1985, p. 1
22 S. Sridhar, D. Reagor, G. Grüner, Phys. Rev. B 34 (1986) 2223
23 W. Rieß, W. Brütting, M. Schwoerer, to be published
2 S. Kagoshima, H. Nagasawa, T. Sambongi, One-Dimensional Conductors, Springer-Verlag, Berlin 1988
3 D. Jerome, H. J. Schulz, Adv. Phys. 31 (1982) 299;
4 For a review of CDW conductors see for example: P. Monceau (ed.), Electronic Properties of Inorganic Quasi-One-Dimensional Compounds I + II, Reidel, Dordrecht 1985;
5 For reviews on the Peierls tansition see for example: L. N. Bulaevskii, Sov. Phys. Usp. 18 (1976) 131;
6 W. Rieß, W. Schmid, J. Gmeiner, M. Schwoerer, Synth. Met. 42 (1991) 2261;
7 V. Enkelmann, B. S. Morra, Ch. Kröhnke, G. Wegner, J. Heinze, Chem. Phys. 66 (1982) 303
8 M. Mehring in: D. Jerome, L. G. Caron (eds.), Low-Dimensional Conductors and Superconductors, Plenum, New York 1987, p. 185
9 Th. Schimmel, B. Koch, H. P. Geserich, M. Schwoerer, Synth. Met. 33 (1989) 311
D. C. Johnston, J. P. Stokes, R. A. Klemm, J. Magn. Magn. Mat. 54 (1986) 1317
D. C. Johnston, Solid State Comm. 56 (1985) 439;
G. A. Toombs, Phys. Rep. 40 (1978) 181
G. Mihaly, Y. Kim, G. Grüner, Phys. Rev. Lett. 66 (1991) 2806
K. Bechgaard, D. Jerome, Physica Scripta T 39 (1991) 37
L. P. Gorkov, G. Grüner (eds.), Charge Density Waves in Solids, North Holland, Amsterdam 1989
W. Höptner, M. Mehring, J. U. v. Schütz, H. C. Wolf, B. S. Morra, V. Enkelmann, G. Wegner, Chem. Phys. 73 (1982) 253
W. Rieß, W. Brütting, M. Schwoerer, Mol. Cryst. Liq. Cryst., in press
- Seitenbereich
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0409 - 0422
- Schlagwort(e)
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<KWD>Low-dimensional systems
Charge Density Waves
Peierls instability
- Zusammenfsg.
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Due to the high anisotropy of the <I>dc</I> conductivity (σ<sub>|</sub>/σ<sub>⊥</sub> ≈ 10<sup>4</sup>) the organic conductor (fluoranthene)<sub>2</sub>X can be regarded as a model system for studying the Peierls instability in quasi-one-dimensional systems. The temperature dependence of the <I>dc</I> conductivity σ<sub>|</sub> (<I>T</I>) along the highly conducting crystal axis exhibits the typical behaviour of a quasi-one-dimensional metal with a Peierls transition at about 180 K to a charge density wave (CDW) ground state. As expected for a highly one-dimensional conductor the exact transition temperature depends on three-dimensional coupling effects and therefore on the size of the counterion X<sup>-</sup> = PF<sub>6</sub><sup>-</sup>, AsF<sub>6</sub><sup>-</sup>, SbF<sub>6</sub><sup>-</sup>. Above the Peierls transition σ<sub>|</sub> (<I>T</I>) can be described quantitatively within a model of CDW fluctuations leading to a pseudo gap in the electronic density of states. Below, the existence of a real energy gap at the Fermi level with a BCS-like temperature dependence determines the charge transport over more than eight orders of magnitude in the electrical resistance. For the intrinsic energy gaps 2 Δ (0), which characterize the ground state of the Peierls semiconductor, values of 120-180 meV have been found for different crystals.
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