One-Dimensional Conductors

Kagoshima, S.; Nagasawa, Hiroshi; Sambongi, Takashi

doi:10.1007/978-3-642-83179-9

Cited by 149 publications

(148 citation statements)

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“…The theory of CDW was triggered by the observations made on the chargetransfer salt TTF-TCNQ in the 1970s and 80s (Denoyer et al 1975, Kagoshima et al 1988, in spite of the fact that the compound exhibits a more complex scenario in the temperature range between 60 K and 33 K due to fluctuations, separate ordering in the different stacks, transverse coupling, commensurate and incommensurate phases etc. In Fig.…”

Section: Charge Density Wavementioning

confidence: 99%

Ordering phenomena in quasi-one-dimensional organic conductors

Dressel

2007

Naturwissenschaften

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Low-dimensional organic conductors could establish themselves as model systems for the investigation of the physics in reduced dimensions. In the metallic state of a one-dimensional solid, Fermi-liquid theory breaks down and spin and charge degrees of freedom become separated. But the metallic phase is not stable in one dimension: as the temperature is reduced, the electronic charge and spin tend to arrange themselves in an ordered fashion due to strong correlations. The competition of the different interactions is responsible for which broken-symmetry ground state is eventually realized in a specific compound and which drives the system towards an insulating state. Here we review the various ordering phenomena and how they can be identified by optic and magnetic measurements. While the final results might look very similar in the case of a charge density wave and a charge-ordered metal, for instance, the physical cause is completely different. When density waves form, a gap opens in the density of states at the Fermi energy due to nesting of the one-dimension Fermi surface sheets. When a one-dimensional metal becomes a charge-ordered Mott insulator, on the other hand, the short-range Coulomb repulsion localizes the charge on the lattice sites and even causes certain charge patterns. We try to point out the similarities and conceptional differences of these phenomena and give an example for each of them. Particular emphasis will be put on collective phenomena which are inherently present as soon as ordering breaks the symmetry of the system.

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Section: Charge Density Wavementioning

confidence: 99%

Ordering phenomena in quasi-one-dimensional organic conductors

Dressel

2007

Naturwissenschaften

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“…From the activated behavior of the conductivity a Peierls gap of ∼ 40 meV has been inferred. 8 Within mean-field weak coupling theory this translates into a transition temperature of T MF ∼ 125 K. Due to the dominant effect of fluctuations in 1D systems the actual Peierls transition is suppressed to about half of this value. An additional transverse ordering transition occurs at 38 K. 8 The observation of diffuse x-ray scattering at Q = 4k F up to 220 K indicates the importance of electronic correlations.…”

Section: Properties Of Ttf-tcnqmentioning

confidence: 99%

“…8 As the ARPES probing depth is comparable to the thickness of a single molecular layer (c/2 = 9.23Å, cf. Fig.…”

Section: Comparison Of Photoemission and Band Theorymentioning

confidence: 99%

“…Charge transfer of ∼ 0.59 electrons per molecule from TTF to TCNQ drives both types of chains metallic. 8,49 The conductivity along b is two to three orders of magnitude larger than perpendicular to it, making TTF-TCNQ a truly quasi-1D metal. Below T P = 54 K a charge density wave (CDW) develops along the b-direction, with wave-vector Q CDW = 0.295 b* (= 0.485Å −1 ).…”

Section: Properties Of Ttf-tcnqmentioning

confidence: 99%

“…Due to the formation of linear molecule stacks in the crystal structure and an electronic charge transfer from cationic to anionic complexes they display strongly anisotropic metallic conductivities. 7,8 Photoemission experiments on such materials often find unusual spectral behavior like the absence of a metallic Fermi edge. 2 However, the lack of information on surface quality, especially with regard to the rapid photon-induced decomposition of organic compounds in the vacuum ultraviolet, 9 casts serious doubts to what extent these observations reflect intrinsic electronic properties or rather a strongly disturbed surface.…”

Section: Introductionmentioning

confidence: 99%

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Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

Sing

Claessen

Finteis

et al. 2001

Journal of Electron Spectroscopy and Related Phenomena

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We study the electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ by means of density-functional band theory, Hubbard model calculations, and angle-resolved photoelectron spectroscopy (ARPES). The experimental spectra reveal significant quantitative and qualitative discrepancies to band theory. We demonstrate that the dispersive behavior as well as the temperature-dependence of the spectra can be consistently explained by the finite-energy physics of the one-dimensional Hubbard model at metallic doping. The model description can even be made quantitative, if one accounts for an enhanced hopping integral at the surface, most likely caused by a relaxation of the topmost molecular layer. Within this interpretation the ARPES data provide spectroscopic evidence for the existence of spin-charge separation on an energy scale of the conduction band width. The failure of the one-dimensional Hubbard model for the low-energy spectral behavior is attributed to interchain coupling and the additional effect of electron-phonon interaction.

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Electronic Structure of Solids

Canadell

2005

Encyclopedia of Inorganic Chemistry

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The basic language needed to understand the electronic structure of solids is introduced. The approach is chemically oriented and the notion of orbital interaction, so useful to understand the electronic structure of molecules, is used as much as possible. A step‐by‐step approach to the electronic structure of several solids is discussed. Notions like Density of states (DOS), Fermi surface (and nesting), Peierls distortions, charge and spin density waves (CDW/SDW), and COOP (crystal orbital overlap population) curves are presented and analyzed with reference to selected examples. The role of electron repulsions is also considered. The relationship between the electronic structure and the structural and transport properties of solids is discussed. A brief account of the more commonly used computational approaches for solids is also presented.

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One-Dimensional Conductors

Cited by 149 publications

References 0 publications

Ordering phenomena in quasi-one-dimensional organic conductors

Ordering phenomena in quasi-one-dimensional organic conductors

Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

Electronic Structure of Solids

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