Charge Distribution in the Surface BEDT-TTF Layer of \alpha-(BEDT-TTF)2I3 at Room Temperature with Scanning Tunneling Microscopy
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概要
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The charge distribution in the surface BEDT-TTF layer of the \alpha-(BEDT-TTF)2I3 crystal with the charge disproportionation state at room temperature was studied in detail by a scanning tunneling microscope (STM), where BEDT-TTF (abbreviated as ET) is bis(ethylenedithio)tetrathiafulvalene. The obtained molecular charge distribution in the surface ET layer suggests that the electronic states of the surface ET layer at room temperature is the charge-ordered state, stable below 135 K in bulk crystals, rather than the charge disproportionation state above 135 K. The most probable mechanism underlying this remarkable finding is the particular freedom to the surface ET layer. The missing of the I3 layer partially removes the structural constraint of the steric interaction between the thermally vibrating ethylene groups and the neighboring two I3 layers. This mechanism would have something in common with the layered ET complexes.
- 2012-01-15
著者
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Mizoguchi Kenji
Department Of Applied Physics School Of Engineering University Of Tokyo
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Sakamoto Hirokazu
Department Of Internal Medicine Wakayama Rosai Hospital
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Naito Toshio
Division of Chemistry and Biology, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan
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MORI Eiichi
Department of Agricultural Chemistry, Faculty of Horticulture, Chiba University
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USUI Hidemasa
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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