A landau theory for the displacive phase transitions in TTF-TCNQ

Weger, M.; Friedel, J.

doi:10.1051/jphys:01977003802024100

Cited by 55 publications

(4 citation statements)

References 43 publications

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“…(i) the detailed dynamical properties close to the transition temperatures, (ii) the structure of the distorted low temperature states, or correspondingly the eigenvectors of the precursor anomalies, Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyslet:01978003908011800 (iii) the origin of the 4 kF scattering (where kF is the Fermi-wave-vector). Is it fundamental in these systems, such as electron-electron correlations [4], or due to an accidental or specific effect present only in TTF-TCNQ [5] ?…”

mentioning

confidence: 99%

Structural evidence of charge density waves in HMTTF-TCNQ (hexamethylene-tetrathiofulvalenium- tetracyanoquinodimethane)

et al. 1978

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mentioning

confidence: 99%

Structural evidence of charge density waves in HMTTF-TCNQ (hexamethylene-tetrathiofulvalenium- tetracyanoquinodimethane)

et al. 1978

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“…Elles reposent sur l'hypoth6se du r61e majeur jou~ par les liaisons S... N par suite de la faible distanize s6parant les atomes en forte interaction coulombienne et de leur grande polarisabilit~. Elles font intervenir les modes de translation et de libration des mol+cules qui affectent les distances S--N, l'accent ~tant mis sur le mouvement de libration autour de l'axe longitudinal Z i (Moravitz, 1975) autour de l'axe normal X iet sur certains mouvements de translation (Weger & Friedel, 1977). D'autres propositions moins r~centes attirent l'attention sur deux facteurs essentiels ~ la circulation des charges: les recouvrements mol+culaires et les distances interplanaires dans les chaines lin~aires (Gaultier, Hauw, Jaud, Dupuis & Neel, 1973;Castagn6, Chasseau, Gaultier, Hauw & Filhol, 1975) qui sont naturellement affect+s par les modes de vibration.…”

Section: Structure Cristallineunclassified

Structure cristalline et moléculaire d'un nouveau metal organique: triméthylène-3,4 tétrathia-2,2',5,5' fulvalène–tétracyano-7,7,8,8 p-quinodimethane (TTTF–TCNQ)

Chasseau¹,

Gaultier²,

Hauw³

et al. 1978

Acta Crystallogr Sect B

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The 1 : 1 charge-transfer complex of 3,2',5,7,8, C2~H~2N4S4) crystallizes in the monoclinic system, space group C2. Lattice parameters are: a = 40.882 (8), b = 3.821 (3), c = 12.277 (5) A, fl = 100-94 (4) °, Z = 4, D c = 1.581 g cm -3. Data were collected by the 0--20 scan technique on a Siemens automatic diffractometer. The structure was solved by the standard heavy-atom method and refined by a least-squares method to a final R value of 0.053. The TCNQ and TTTF ions, stacked in a classic way, form segregated columns with interplanar spacings of 3.20 and 3.58 A respectively. The interchain coupling is stronger than in analogous S conductors; the columns are strongly bonded, the S...N distances being 3.21 and 3.11 tk (the shortest reported so far). There are also noteworthy CH...N hydrogen bonds. The effects of thermal motion upon interplanar spacings and S... N intermolecular bond lengths are investigated.

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“…The molecular polarization model with the particular emphasis on the coupling between CN group of the TCNQ molecule and the sulphur atom of the TTF molecule was discussed in Ref. [24].…”

Section: Dynamics Of the D = 1 Fluctuationsmentioning

confidence: 99%

Peierls Instabilities Ii. Ginzburg-Landau Model

Ič

Bjeli

1977

J. Phys. Colloques

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Rhumb.-On donne une revue de I'approche Ginzburg-Landau des instabilites structurelles, qui sont observies dans les conducteurs unidimensionnels. La statique des fluctuations d'une chaine Golk est dtcrite. Le traitement par Brazovskii et Dzyaloshinskii de la dynamique correspondante est aussi brikvement mentionnt, en relation avec la supraconductivitt de Frohlich. Finalement nous dCcrivons les effets de couplages interchaines sur I'ordre transversal des systkmes a chaines. Le modkle est utilisC pour interprkter les instabilitks de TTF-TCNQ a 2 k,.

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A landau theory for the displacive phase transitions in TTF-TCNQ

Cited by 55 publications

References 43 publications

Structural evidence of charge density waves in HMTTF-TCNQ (hexamethylene-tetrathiofulvalenium- tetracyanoquinodimethane)

Structural evidence of charge density waves in HMTTF-TCNQ (hexamethylene-tetrathiofulvalenium- tetracyanoquinodimethane)

Structure cristalline et moléculaire d'un nouveau metal organique: triméthylène-3,4 tétrathia-2,2',5,5' fulvalène–tétracyano-7,7,8,8 p-quinodimethane (TTTF–TCNQ)

Peierls Instabilities Ii. Ginzburg-Landau Model

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