Dielectric properties of the low dimensional vanadium oxides Ba2V3O9 and Sr2V3O9

被引：6

作者：

Bobnar, V

Lunkenheimer, P

Loidl, A

Kaul, EE

Geibel, C

机构：

[1] Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany

[2] Max Planck Inst Chem Phys Fester Stoffe, D-01187 Dresden, Germany

来源：

SOLID STATE COMMUNICATIONS | 2002年 / 122卷 / 11期

关键词：

magnetically ordered materials; semiconductors; dielectric response; electronic transport;

D O I：

10.1016/S0038-1098(02)00220-X

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The dielectric response of the low-dimensional vanadium oxides Ba2V3O9 and Sr2V3O9 has been investigated in the frequency range of 20 Hz-1 MHz. At low frequencies the dielectric response is governed by strong relaxation-like features, which we attribute to Maxwell-Wagner type contact contributions. The analysis of the complex dielectric spectra in terms of an equivalent circuit revealed the intrinsic dielectric constant and dc conductivity of these systems. The frequency-dependent ac conductivity in both systems follows the universal dielectric response behaviour, clearly indicating that hopping of localised charge carriers is the dominating charge-transport process. Also, a newly observed dielectric relaxation process in both systems is reported and we find evidence for a phase transition close to 455 K in both materials. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：595 / 599

页数：5

共 16 条

[11] AC CONDUCTIVITY IN LA2CUO4 [J].