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

页码：393 / 395

页数：3

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