Optical study of metal-insulator transitions in Ti4O7 single crystals

被引：15
|
作者：
Watanabe, Masayuki [1 ]
Ueno, Wakana [1 ]
Hayashi, Tetsusuke [1 ]
机构：
[1] Kyoto Univ, Grad Sch Human & Environm Studies, Kyoto 6068501, Japan
来源：
JOURNAL OF LUMINESCENCE | 2007年 / 122卷 / 1-2期
关键词：
Ti4O7; Magneli phase; transition metal oxide; bipolaron; metal-insulator transition;
D O I：
10.1016/j.jlumin.2006.01.149
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We have investigated the optical properties of Ti4O7 single crystals. It is found that the reflection spectrum changes discontinuously at about 150 and 130K. These temperatures correspond to two-phase transitions, i.e., metal-semiconductor and semiconductor semiconductor transition. The spectra are analyzed with the use of a classical dielectric function. It is inferred that the changes in the spectrum at the two-phase transitions originate from formation of bipolarons, which induce a splitting of the Ti 3d band into bonding and antibonding states. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：393 / 395
页数：3
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