Perylene hexafluoroantimonate: Suppression of the Peierls transition by anion-chain disorder |
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| Authors: | C Buschhaus R Desquiotz K Eichhorn M Hofmann K Hümmer V Illich M Kelemen S Tarragona Auga T Wokrina A Zitsch E Dormann |
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| Institution: | Physikalisches Institut, Universit?t Karlsruhe (TH), 76128 Karlsruhe, Germany, DE
Institut für Kristallographie, Universit?t Karlsruhe (TH), 76128 Karlsruhe, Germany, DE
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| Abstract: | Crystal growth and X-ray structural analysis are reported for the new quasi-one-dimensional organic conductor perylene hexafluoroantimonate.
Due to deviation from exact 4:3 stoichiometry and anion-chain disorder the three-dimensional Peierls transition is suppressed
to temperatures below 30 K in spite of a molecular field transition temperature of 330 K. Anisotropy of the microwave conductivity
exceeds 3000:1 at room temperature. Curie paramagnetic defects with comparatively small electron spin resonance line width
predominate at low temperature. Thermally activated paramagnetic defects, giving rise to pronounced Overhauser shift, are
separated in the 30-100 K range. They are explained by neutral Perylene intra-stack defects, whose concentration can be reduced
by both aging and annealing. The angular and temperature dependence of the conduction electron spin resonance line is analysed
in detail, exhibiting the influence of intra-stack dipole interaction growing with temperature. Restricted diffusion of the
conduction electron spins with diffusion coefficient of about 6 cm2/s parallel to the stacking direction is detected by fixed gradient pulsed electron spin resonance at room temperature.
Received 17 July 1998 |
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| Keywords: | PACS 61 65 +d Specific structure of organic compounds - 72 80 Le Organic semiconductors - 76 30 -v Electron paramagnetic resonance and relaxation |
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