Effect of chemical doping on the ferroelectric neutral-ionic phase transition in tetrathiafulvalene-p-chloranil (TTF-QCl4)

被引:19
作者
Horiuchi, S [1 ]
Kumai, R
Okimoto, Y
Tokura, Y
机构
[1] Joint Res Ctr Atom Technol, Tsukuba, Ibaraki 3050046, Japan
[2] Univ Tokyo, Dept Appl Phys, Tokyo 1130033, Japan
来源
PHYSICAL REVIEW B | 1999年 / 59卷 / 17期
关键词
D O I
10.1103/PhysRevB.59.11267
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Effects of molecular substitution on the neutral-ionic (NI) phase transition have been investigated for tetrathiafulvalene (TTF)-p-chloranil (QCl(4)) complex doped with tetraselenafulvalene (TSF) or trichloro-p-benzoquinone (QCl(3)) molecules. Except for the fully substituted compound TTF-QCl(3) of minor structural modifications, x-ray-diffraction measurements confirm the isostructurality over a wide compositional range as well as smooth change in the lattice constants by molecular replacement. With increasing TSF concentration, the peak in the dielectric constant corresponding to the ferroelectric NI transition smoothly shifts toward zero temperature due to the lattice expansion. Around the critical concentration are found some characteristics of quantum ferro(para)electricity. Although the increment of QCl(3) concentration also lowers the peak temperature of the dielectric constant, the dielectric anomalies reveal glasslike frequency dependence. We attributed the glasslike behavior to the strong "pinning-impurity'' effect of QCl(3) which yields binary-phase separation into ferroelectric (ionic) and paraelectric (neutral) regions. [S0163-1829(99)03617-6].
引用
收藏
页码:11267 / 11275
页数:9
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