Probing the metal-insulator phase transition in the (DMEDO-EBDT)_2PF_6 single crystal by optical measurements
Probing the metal-insulator phase transition in the (DMEDO-EBDT)_2PF_6 single crystal by optical measurements
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通过光学测量探测 (DMEDO-EBDT)_2PF_6 单晶中的金属-绝缘体相变
DOI：
10.1088/0953-8984/24/19/195501
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Y Misaki
中科院分区：
文献类型：
--
作者：
T Ishikawa;M Kitayama;A Chono;K Onda;Y Okimoto;S Koshihara;Y Nakano;H Yamochi;T Morikawa;T Shirahata;Y Misaki
研究了准一维1/4填充带体系（DMEDO-EBDT） 2pf6反射率光谱的温度和偏振依赖性。我们观察到与各向异性输运性质相对应的电子结构具有明显的各向异性。在此过程中，可以清楚地观察到带电隙（E g> 0.1 eV）的出现和谱权的转移，并伴有金属-绝缘体相变。此外，分子内振动模式出现分裂，这表明在低温阶段存在电荷歧化现象。我们还观察到光致反射率的变化，这意味着发生了从低温绝缘相到高温金属相的光致相变。
The temperature and polarization dependence of the optical reflectivity spectra of a quasi-one-dimensional 1/4-filled band system,(DMEDO-EBDT) 2 PF 6, have been investigated. We observed clear anisotropy in the electronic structures corresponding to the anisotropic transport properties. The appearance of a charge gap (E g> 0.1 eV) and transfer of the spectral weight accompanied by the metal–insulator phase transition were clearly observed. In addition, a split of the intramolecular vibrational modes was observed, which strongly suggested the existence of charge disproportionation in the low temperature phase. We also observed a photoinduced reflectivity change, which implied the occurrence of a photoinduced phase transition from the low temperature insulating phase to the high temperature metallic phase.