Characteristics and the nature of the low-frequency dielectric response in moderately concentrated KTaO3:Li

被引：24

作者：

Prosandeev, SA

Trepakov, VA

Savinov, ME

Jastrabik, L

Kapphan, SE

机构：

[1] Rostov State Univ, Dept Phys, Rostov Na Donu 344090, Russia

[2] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

[3] AS CR, Inst Phys, Prague 18221 8, Czech Republic

[4] Univ Osnabruck, Fachbereich Phys, D-49069 Osnabruck, Germany

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2001年 / 13卷 / 43期

关键词：

D O I：

10.1088/0953-8984/13/43/306

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The temperature-frequency behaviour of the complex dielectric permittivity Of K0.957Li0.043TaO3 (KLT) was studied in detail. Below 250 K a pronounced relaxation-type dielectric dispersion occurs with two wide temperature maxima shifted to lower temperatures increasing in magnitude as the alternating-current monitoring frequency decreases. The results obtained are analysed by using a theory proposed considering the coupling of the TO1 soft mode (TO standing for transverse optical) to two Li relaxation modes known in moderately concentrated KLT as pi- and (pi /2)-relaxations.

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页码：9749 / 9760

页数：12

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