Anomalous valence fluctuation near a ferroelectric transition in an organic charge-transfer complex

被引：67

作者：

Horiuchi, S ^{[1
]}

Okimoto, Y

Kumai, R

Tokura, Y

机构：

[1] Joint Res Ctr Atom Technol, Tsukuba, Ibaraki 3050046, Japan

[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2000年 / 69卷 / 05期

关键词：

charge-transfer complex; TTF; neutral-ionic transition; valence fluctuation; ferroelectricity;

D O I：

10.1143/JPSJ.69.1302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dielectric susceptibility, X-ray diffraction and infrared molecular vibrational spectra have been investigated for a charge-transfer complex, tetrathiafulvalene (TTF)-2-bromo-3,5,6-trichloro-p-benzoquinone (QBrCl(3)) to probe a ferroelectric valence transition at T-c = 66 K in comparison with the typical first-order neutral-ionic transition in the isostructural analog, TTF-p-chloranii (QCl(4)). Around T-c, the anomalously rapid fluctuation of molecular valence between the quasineutral and quasi-ionic state is evidenced by the temperature variation of infrared spectra, signaling the quantum motion of the neutral-ionic domain walls on the one-dimensional molecular stacks.

引用

页码：1302 / 1305

页数：4

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