PHOTO-HALL EFFECT IN STRONTIUM TITANATE
PHOTO-HALL EFFECT IN STRONTIUM TITANATE
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DOI：
10.1143/jpsj.24.1035
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发表时间：
1968-01-01
影响因子：
1.7
通讯作者：
YASUNAGA, H
中科院分区：
文献类型：
--
作者：
YASUNAGA, H
在10 ~ 230°K的温度范围内测量了纯srtio3单晶中光电子的光电导率和霍尔迁移率。由于SrTiO3的介电常数较大，测量方法采用传统的直流电法和连续照明，没有受到空间电荷的影响。在47°K附近观察到光导率温度依赖性的大异常。在相应的温度下，霍尔迁移率表现出轻微的异常。这些异常是由于一小部分样品在47°K左右发生了铁电跃迁。霍尔迁移率μ H在30至230°K的温度范围内呈幂律温度依赖性，形式为μ H=1.25×108T-3cm2/伏特·秒，在30°K以下与t -3/2成正比，其中30°K为绝对温度。这些温度依赖性可以用谷内声模和谷间光模的混合散射来解释。
The photoconductivity and the Hall mobility of photo-electrons in pure SrTiO3single crystals have been measured over the temperature range from 10 to 230°K. The measurements have used the conventional dc method and continuous illumination, but have suffered from no effect of space charge owing to the large dielectric constant of SrTiO3. A large anomaly in the photoconductivity temperature dependence has been observed around 47°K. At corresponding temperatures the Hall mobility exhibits a slight anomaly. These anomalies are due to a ferroelectric transition of a small fraction of sample around 47°K. The Hall mobility µHexhibits a power-law temperature dependence of the form µH=1.25×108T-3cm2/volt·sec over the temperature range from 30 to 230°K and is proportional toT-3/2below 30°K, whereTis the absolute temperature. These temperature dependences can be explained in terms of the mixed scattering by the intra-valley acoustical modes and the inter-valley optical modes.