Títol:
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Structural and electronic properties of the one-dimensional organic metal bis(thiodimethylene)-tetrathiafulvalene tetracyanoquinodimethane
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Autor/a:
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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, J. P.
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Altres autors:
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Universitat de Barcelona |
Abstract:
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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. |
Matèries:
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-Estructura electrònica -Propietats magnètiques -Propietats òptiques -Conductors orgànics -Espectres de vibració -Electronic structure -Magnetic properties -Optical properties -Organic conductors -Vibrational spectra |
Drets:
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(c) The American Physical Society, 1995
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Tipus de document:
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Article Article - Versió publicada |
Publicat per:
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The American Physical Society
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Compartir:
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