PHOTOINDUCED GAP STATE IN THE MOTT-HUBBARD SYSTEM OF HALOGEN-BRIDGED N1-3+ COMPLEX ((NI(CHXN)2BR)BR2)

被引：20

作者：

OKAMOTO, H ^{[1
]}

OKANIWA, K ^{[1
]}

MITANI, T ^{[1
]}

TORIUMI, K ^{[1
]}

YAMASHITA, M ^{[1
]}

机构：

[1] NAGOYA UNIV,COLL GEN EDUC,NAGOYA,AICHI 464,JAPAN

来源：

SOLID STATE COMMUNICATIONS | 1991年 / 77卷 / 06期

关键词：

D O I：

10.1016/0038-1098(91)90238-Q

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Photo-induced i.r. absorption measurements have been made on the bromo-bridged Ni3+ complex ({Ni(chxn)2Br}Br2: chxn = cyclohexane-diamine), which has the one-dimensional Mott-Hubbard-type ground state. A photo-induced absorption band was observed around 0.25 eV, which is a considerably lower energy than the lowest exciton transition at 1.3 eV. In the Mott-Hubbard system, this is the first observation of the gap state, which can be ascribed to the formation of small polarons accompanied by the displacements of the bridging bromine ions after photo-excitation of an electron-hole pair. This interpretation is supported by both the observed results of the laser-intensity dependence of the photo-induced signals and the quantum-yield spectra of photoconductivity.

引用

页码：465 / 469

页数：5

共 23 条

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