Relative stability of donor and acceptor stacks against Peierls distortion in the tetrathia- and tetraselenafulvalene-tetracyanoquinodimethane family of organic metals

Tomkiewicz, Y.; Andersen, Jan Rud; Taranko, A. R.

doi:10.1103/physrevb.17.1579

Cited by 37 publications

(21 citation statements)

References 63 publications

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“…Since the distance in this case is even longer than the sum of the van der Waals radii, TMTSF-DMTCNQ is expected to be the most onedimensional organic conductor based on a tetraselenafulvalene known. This point of view is supported by spin-resonance data, where a narrow (~70 G) ESR signal was observed (Tomkiewicz, Andersen & Taranko, 1978) and also by anisotropy measurements, where the room-temperature conductivity was found to be 200-300 times less in both transverse directions compared to the highly conducting a direction (Jacobsen, Mortensen, Andersen & Bechgaard, 1978).…”

Section: Resultsmentioning

confidence: 77%

The crystal and molecular structure of the organic conductor 2,3,6,7-tetramethyl-1,4,5,8-tetraselenafulvalenium 2,5-dimethyl-7,7,8,8-tetracyano-p-quinodimethanide (TMTSF–DMTCNQ)

Andersen¹,

Bechgaard²,

Jacobsen³

et al. 1978

Acta Crystallogr B Struct Sci

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The crystal and molecular structure of the highly conducting 1:1 charge-transfer salt 2, 3,6,4,5,7,8, was determined from diffractometer data. The unit cell is triclinic, space group Pi: a = 3. . Full-matrix least-squares refinement gave a final R = 0.039 for 2348 observed reflections measured by the w-scan technique on a four-circle diffractometer with graphite-monochromatized Mo Ktt radiation. The TMTSF cations and DMTCNQ anions form segregated, homologous stacks in the crystal with interplanar spacings of 3.64 and 3-31 A respectively. The planes of the ions are tilted in opposite directions relative to the short a axis. Their normals make an angle of 45-8 °. The interesting Se-N distance is 3.48 A, which is the longest distance reported so far for this class of materials. " Another important feature is the low symmetry of the DMTCNQ molecules, which modifies the stacking mode of the acceptor columns and may produce lower electron mobility.

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Section: Resultsmentioning

confidence: 77%

The crystal and molecular structure of the organic conductor 2,3,6,7-tetramethyl-1,4,5,8-tetraselenafulvalenium 2,5-dimethyl-7,7,8,8-tetracyano-p-quinodimethanide (TMTSF–DMTCNQ)

Andersen¹,

Bechgaard²,

Jacobsen³

et al. 1978

Acta Crystallogr B Struct Sci

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“…At T cˆ4 2 K a transition from metallic (high temperature) to semiconducting (low temperature) properties is observed in conductivity [151] and magnetic [152] measurements. Below this transition from the conductivity activation energy the gap energy is derived as E gˆ2 90 K [151].…”

Section: A Special Case: Tmtsf±dmtcnqmentioning

confidence: 92%

“…Below this transition from the conductivity activation energy the gap energy is derived as E gˆ2 90 K [151]. The observation of a three-dimensionally ordered superstructure [153] of longitudinal period 4a (in the TMTSF±DMTCNQ structure the direction also the chains is usually denoted a [150] (ii) the indication both from magnetic [152] and transport measurements that the TMTSF (i.e. donor) chains drive the transition, unlike most other organic conductors (see section 4.1).…”

Section: A Special Case: Tmtsf±dmtcnqmentioning

confidence: 99%

Organic conductors and superconductors

Jérôme¹,

Schulz²

2002

Advances in Physics

103

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“…Much attention was put on the tetramethylated derivative of the TSF molecule which, when combined to the dimethylated TCNQ gave rise to TMTSF-DMTCNQ [39].The outcome of the high pressure study of this latter compound has been truly decisive for the quest of organic superconductivity [39,40,41]. First, the metal insulator transition located at 42 K has been identified by X-ray diffuse scattering experiments [42] as a Peierls transition driven by the TMTSF chain and a quarter filling of both donor and acceptor bands of this charge transfer compound has been derived from the measurement of the wave vector 2k F in the Peierls state.…”

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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Relative stability of donor and acceptor stacks against Peierls distortion in the tetrathia- and tetraselenafulvalene-tetracyanoquinodimethane family of organic metals

Cited by 37 publications

References 63 publications

The crystal and molecular structure of the organic conductor 2,3,6,7-tetramethyl-1,4,5,8-tetraselenafulvalenium 2,5-dimethyl-7,7,8,8-tetracyano-p-quinodimethanide (TMTSF–DMTCNQ)

The crystal and molecular structure of the organic conductor 2,3,6,7-tetramethyl-1,4,5,8-tetraselenafulvalenium 2,5-dimethyl-7,7,8,8-tetracyano-p-quinodimethanide (TMTSF–DMTCNQ)

Organic conductors and superconductors

Organic Superconductors: When Correlations and Magnetism Walk in

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