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Title: Structural and electronic properties of the one-dimensional organic metal bis(thiodimethylene)-tetrathiafulvalene tetracyanoquinodimethane
Author: Rovira i Angulo, Concepció
Tarrés, J.
Llorca, J.
Molins i Grau, Elies
Veciana, Jaume
Yang, S.
Cowan, D. O.
Garrigou-Lagrange, C.
Amiell, J.
Delhaes, Pierre
Canadell, Enric, 1950-
Pouget, Jean-Paul
Keywords: Estructura electrònica
Propietats magnètiques
Propietats òptiques
Conductors orgànics
Espectres de vibració
Electronic structure
Magnetic properties
Optical properties
Organic conductors
Vibrational spectra
Issue Date: 1995
Publisher: The American Physical Society
Abstract: The synthesis and structural characterization at room temperature and 130 K of the organic charge-transfer salt bis(thiodimethylene)-tetrathiafulvalene tetracyanoquinodimethane (BTDMTTF-TNCQ) is reported. X-ray diffuse scattering as well as ir and Raman measurements show that the charge transfer in this salt is ∼0.5. BTDMTTF-TCNQ remains metallic down to very low temperatures but exhibits an anomaly at 175 K in the conductivity and thermopower which could be related to some unusual structural modification of the unit cell. Band-structure calculations show that this salt is a narrow-band one-dimensional metal. The high value of the spin susceptibility, the low value of the conductivity, and the observation of a 4 k F charge-density-wave (CDW) instability around room temperature prove that it is a highly correlated metal. In contrast with other salts of the TTF-TCNQ family, BTDMTTF-TCNQ does not exhibit critical 2 k F structural fluctuations. It is proposed that the absence of the 2 k F CDW transition is due to the stronger interlocking of the donor and acceptor molecules due to the presence of the sulfur atoms in the central position of the outer five-membered rings of the BTDMTTF donor.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 1995, vol. 52, nm. 12, p. 8747-8758.
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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