凝聚态物理
铁电性
电场
各向异性
热导率
材料科学
声子
电阻率和电导率
垂直的
电敏感性
杂质
物理
电导率
电介质
磁场
光学
极化密度
磁化
量子力学
光电子学
数学
复合材料
几何学
作者
William Huber,Luís Hernández,A. M. Goldman
出处
期刊:Physical review
日期:2000-10-01
卷期号:62 (13): 8588-8591
被引量:19
标识
DOI:10.1103/physrevb.62.8588
摘要
Thermal conductivity measurements have been carried out on single crystals of ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{KTaO}}_{3}$ in the presence of electric fields applied either perpendicular or parallel to the heat current. In the case of ${\mathrm{SrTiO}}_{3},$ the response is surprisingly large: a 7 kV/cm parallel field increases the thermal conductivity by up to $400%.$ A pronounced anisotropy in both materials, which becomes apparent above nearly the same temperature, is also observed. These effects can be interpreted qualitatively using a simple model in which TA phonons in an energy band near the soft TO mode scatter off of either impurities, ferroelectric microregions, or quantum ferroelectric fluctuations.
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