Novel Type of Career Generated System: Magnetic Investigations of TTF-Based Self-Doped Hydrogen-Bonding Conductor
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概要
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Magnetic investigations, including static magnetic susceptibility and high-field electron spin resonance (ESR) measurements, were carried out for an organic conductor, (TTFCOO)[(NH4+1)1-x(NH3)x]. Anisotropic ESR parameters were determined for powder samples using a high-frequency W-band (93.9817 GHz) ESR spectrometer. The observed principal values of the $\mathbf{g}$-tensor and quantum chemical calculation results indicate that the observed spin is distributed on quasi-hole-like TTF skeletons, and that the TTFCOO mainframe partially becomes a neutral radical. The temperature dependence of the spin susceptibility is well fitted with a Curie–Weiss term and an activation-type term, with the activation-type term dominant at high temperatures. The high absolute value of the spin susceptibility and the extremely small activation energy, $\Delta$, indicate that a quasi-degenerate (metallic) state is stabilized in (TTFCOO)[(NH4+1)1-x(NH3)x], although the weakly temperature-dependent ESR linewidth indicates a localized characteristic. A novel type of carrier generation, self-doping, was discussed.
- 2010-05-15
著者
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FURUKAWA Ko
Institute for Molecular Science
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Nakamura Toshikazu
Institute For Molecular Science
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Ogura Takashi
Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, Shinjuku, Tokyo 162-0041, Japan
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Kobayashi Yuka
Waseda Institute for Advanced Study, Waseda University, Shinjuku, Tokyo 169-8050, Japan
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