Two-Dimensional Band Structure of Organic Metals (BDT-TTP)_2X (X=SbF_6,AsF_6)Studied by Polarized Reflection Spectroscopy
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概要
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Polarized reflectance spectra were naeastrred on the conductive (010) plane of' rnetallic (BDT-TTP)2X (X:SbFo, ASF6) single crvstals at rooraa and low ternt>erattrres. Well-defined P121,$11121edges appeared in both directions parallel (,/'a) and perjcendictml?tr (t a) to the utaolectrlar starck,indicating two-dinuension?tl band structtrres xvith a significant anisotropy. The intra- and inter-stack transf'er integrals were estitaaarted frotaa the jc1asrn?r freqtrencies in the frautaework of tight-binding rtaodel. Based on these tr?tnsf'er integrarls, the energy dispersion, density of state, andFernai strrface were calcttlated. The Fermi sttrfaces of both coraapovxnds wer'e open in the k.direction. The temperattmre dependence of the transf'er integrals was deten'rnined by anttlyzingtlae low-tettaper?tture spectra. The irrtra-stack transfer integral increased by abotrt 30% whereasthe enhanceraaent of infer-stack transfer integral wa.s very wealc. So the systetaa becarane tnoreanisotropic at low tertaperattrres. The strongly appeared CH stretching taaode in the l a spectrasuggested that the conjtrgated 'm-electrons xvere externded over the hydrogen atoraas of' BDT-TTPraaolectrle.
- 1998-09-15
著者
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Tanaka Kazuyoshi
Department of Biofunctional Informatics, Graduate School of Health Care Sciences, Tokyo Medical and
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Yakushi Kyuya
Graduate University For Advanced Studies And Institute For Molecular Science
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OUYANG Jianyong
Graduate University for Advanced Studies and Institute for Molecular Science
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MISAKI Yoji
Department of Molecular Engineering,Kyoto University
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Yakushi Kyuya
Graduate University For Advanced Studies
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Misaki Yoji
Department Of Molecular Engineering Kyoto University
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Tanaka Kazuyoshi
Department Of Biofunctional Informatics Graduate School Of Health Care Sciences Tokyo Medical And De
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TANAKA Kazuyoshi
Department of Molecular Engineering,Kyoto University
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