Quantum neutral-ionic phase transition as investigated by Raman scattering and X-ray diffraction

被引：12

作者：

Okimoto, Y ^{[1
]}

Kumai, R

Horiuchi, S

Okamoto, H

Tokura, Y

机构：

[1] Natl Inst Adv Ind Sci & Technol, Correlated Elect Res Ctr, Tsukuba, Ibaraki 3058562, Japan

[2] Univ Tokyo, Dept Adv Mat Sci, Chiba 2778561, Japan

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

[4] ERATO, Japan Sci & Technol Agcy, Spin Superstruct Proj, Tsukuba, Ibaraki 3058562, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2005年 / 74卷 / 08期

关键词：

neutral-ionic phase transition; Raman scattering; x-ray diffraction;

D O I：

10.1143/JPSJ.74.2165

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The neutral-ionic (N-I) phase transitions of the molecular valence state have been investigated by Raman spectroscopy and x-ray diffraction for a series of isostructural charge-transfer complexes, 4,4'-dimethyltetrathiafulvalene-p-chloranil (DMTTF-QCl(4)) and Br-substituted analogs DMTTF-QB(n)Cl(4-n), in which the N-I transition temperature can be critically controlled with n. The anomalously broadened Raman spectrum of the valence-probing molecular vibration as well as the diffuse x-ray scattering of the ionic superlattice is observed ubiquitously around the N-I phase boundary, including the vicinity of the quantum critical (OK-transition) point. The results quantify the quantum fluctuation between the two states of matter, van der Waals and ionic crystals.

引用

页码：2165 / 2168

页数：4

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