Photo-Hall Effect in Strontium Titanate

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Abstract
The photoconductivity and the Hall mobility of photo-electrons in pure SrTiO 3 single 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 SrTiO 3 . 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 µ H exhibits a power-law temperature dependence of the form µ H =1.25×10 8 T -3 cm 2 /volt·sec over the temperature range from 30 to 230°K and is proportional to T -3/2 below 30°K, where T is 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.

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