X-Ray-Diffuse-Scattering Evidence for a Phase Transition in Tetrathiafulvalene Tetracyanoquinodimethane (TTF-TCNQ)

Dénoyer, F.; Comes, F. J.; Garito, A. F.; Heeger, Alan J.

doi:10.1103/physrevlett.35.445

Cited by 346 publications

(56 citation statements)

References 29 publications

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“…Besides, the Orsay group showed from X-ray scattering studies that the metal insulator transition at 59 K was the consequence of the instability of a conducting chain predicted by Peierls [31]. The X-ray diffuse scattering study did provide an important information namely, the band filling of TTF − TCNQ is incommensurate with a charge transfer of ρ = 0.59 at 300 K [31].…”

Section: The Charge Transfer Period First Organic Conductorsmentioning

confidence: 99%

Organic Superconductors: When Correlations and Magnetism Walk in

Jérôme

2012

J Supercond Nov Magn

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This survey provides a brief account for the start of organic superconductivity motivated by the quest for high T c superconductors and its development since the eighties'. Besides superconductivity found in 1D organics in 1980, progresses in this field of research have contributed to better understand the physics of low dimensional conductors highlighted by the wealth of new remarkable properties. Correlations conspire to govern the low temperature properties of the metallic phase. The contribution of antiferromagnetic fluctuations to the interchain Cooper pairing proposed by the theory is borne out by experimental investigations and supports supercondutivity emerging from a non Fermi liquid background. Quasi one dimensional organic superconductors can therefore be considered as simple prototype systems for the more complex high T c materials.

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Section: The Charge Transfer Period First Organic Conductorsmentioning

confidence: 99%

Organic Superconductors: When Correlations and Magnetism Walk in

Jérôme

2012

J Supercond Nov Magn

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“…Note added in proof:-While this manuscript was in the press, Denoyer, Com~s, Garito & Heeger (1975) and Kagoshima, Anzai, Kajimura & Ishigura (1975) independently reported weak diffuse X-ray scattering arising from a Peierls distortion in TTF-TCNQ below 53 K.…”

Section: Discussion Of the Diffuse Scattering And The Weak Specular Lmentioning

confidence: 99%

Crystal structure and diffuse X-ray scattering of the 1.3:2 salt of 4,4',5,5'-tetramethyl-Δ^2,2-bis-1,3-dithiole [TMTTF] and 7,7,8,8-tetracyano-p-quinodimethane [TCNQ], a nonstoichiometric quasi one-dimensional organic conductor

Kistenmacher¹,

Phillips²,

Cowan³

et al. 1976

Acta Crystallogr Sect B

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The diffraction properties of an unusual radical cation-radical anion salt of composition (TMTTF)I.a(TCNQ)2 [(CIoHI2S4)l.a(C12H4N4)2] have been studied by single-crystal X-ray methods.The diffraction patterns show a strong subcell of monoclinic symmetry, space group P2~/n, with a= 3-819(1), b= 13.021 (6), c= 34.827 (14)/~, fl= 91"68 (3) °, V= 1731.1 ,~a, Z= 2 (for the empirical formula 1.3:2), Dm = 1"43 (1), De= 1"433 g cm -3. Intensities for 2731 reflections with l>a(I)were collected by counter methods in this subcell. The structure was solved by conventional heavy-atom Patterson and Fourier methods and has been refined by full-matrix least-squares calculations to a final R value of 0.127. The final weighted R value and goodness-of-fit are 0.114 and 2.5, respectively. The subcell structure is dominated by homologous columns of cations and anions running parallel to the short a axis. The interplanar spacing in the TCNQ columns is small, 3.24 /~, while the spacing in the TMTTF columns is 3.59/~ and corresponds to about the expected van der Waals separation. Among the columns of molecular cations and anions are channels of TMTTF residues (0.6 per subcell). The end-to-end alignment of the TMTTF residues in these channels approximately parallels the a axis and the stacks of cations and anions. Oscillation photographs about the a axis show a set of diffuse layer lines with a period corresponding to 10/3a. These are interpreted as arising from an incipient Peierls distortion of the columns, the first observed in an organic system. The material is a semiconductor with a room temperature conductivity of order 10 .Q-~ cm-~

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“…Well-known examples of charged periodic structures are the Wigner crystal, [9][10][11]33,34 charged colloidal crystals, 35 and charge density waves. [36][37][38] In many charged systems, unscreened Coulomb interactions are present:…”

Section: Elasticity and Disorder In Periodic Systemsmentioning

confidence: 99%

Coulomb disorder in periodic systems: Effect of unscreened charged impurities

Orignac¹,

Rosso²,

Читра³

et al. 2006

Phys. Rev. B

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We study the effect of unscreened charged impurities on periodic systems. We show that the longwavelength component of the disorder becomes long ranged and dominates static correlation functions. On the other hand, because of the statistical tilt symmetry, dynamical properties such as pinning remain unaffected. As a concrete example, we focus on the effect of Coulombian disorder generated by charged impurities on three-dimensional charge density waves with nonlocal elasticity. We calculate the x-ray intensity and find that it is identical to the one produced by thermal fluctuations in a disorder-free smectic-A phase. We discuss the consequences of these results for experiments.

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X-Ray-Diffuse-Scattering Evidence for a Phase Transition in Tetrathiafulvalene Tetracyanoquinodimethane (TTF-TCNQ)

Cited by 346 publications

References 29 publications

Organic Superconductors: When Correlations and Magnetism Walk in

Organic Superconductors: When Correlations and Magnetism Walk in

Crystal structure and diffuse X-ray scattering of the 1.3:2 salt of 4,4',5,5'-tetramethyl-Δ^2,2-bis-1,3-dithiole [TMTTF] and 7,7,8,8-tetracyano-p-quinodimethane [TCNQ], a nonstoichiometric quasi one-dimensional organic conductor

Coulomb disorder in periodic systems: Effect of unscreened charged impurities

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X-Ray-Diffuse-Scattering Evidence for a Phase Transition in Tetrathiafulvalene Tetracyanoquinodimethane (TTF-TCNQ)

Cited by 346 publications

References 29 publications

Organic Superconductors: When Correlations and Magnetism Walk in

Organic Superconductors: When Correlations and Magnetism Walk in

Crystal structure and diffuse X-ray scattering of the 1.3:2 salt of 4,4',5,5'-tetramethyl-Δ2,2-bis-1,3-dithiole [TMTTF] and 7,7,8,8-tetracyano-p-quinodimethane [TCNQ], a nonstoichiometric quasi one-dimensional organic conductor

Coulomb disorder in periodic systems: Effect of unscreened charged impurities

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Crystal structure and diffuse X-ray scattering of the 1.3:2 salt of 4,4',5,5'-tetramethyl-Δ^2,2-bis-1,3-dithiole [TMTTF] and 7,7,8,8-tetracyano-p-quinodimethane [TCNQ], a nonstoichiometric quasi one-dimensional organic conductor