DISORDER AND THERMAL TRANSPORT IN UNDOPED KTAO(3)

被引：97

作者：

SALCE, B ^{[1
]}

GRAVIL, JL ^{[1
]}

BOATNER, LA ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37830 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1994年 / 6卷 / 22期

关键词：

D O I：

10.1088/0953-8984/6/22/007

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The thermal conductivity of nominally pure KTaO3 exhibits an unexpected strong phonon scattering around 8 K. The question arises whether this scattering is related to the distorted microregions observed by other experiments. We have investigated a set of undoped single crystals grown by different methods. By comparison with doped specimens, it is suggested that acoustic phonons we coupled to the soft optic mode via the local disorder. From complementary dielectric permittivity and electron paramagnetic resonance experiments, oxygen vacancies and rhombic Fe3+ appear to be incontestable candidates to account for the distorted microregions.

引用

页码：4077 / 4092

页数：16

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