Galvanomagnetic Effect of TlBr

Abstract

Galvanomagnetic studies were performed for the photocarriers in TlBr with the transient method between 100 K and 1.8 K. The measurements of Hall effect indicate that the photoconduction is of two-carrier. The change of the sign of the Hall angle is observed as the temperature decreases. It is observed that at relatively high temperature (>20 K) the dominant contributor to the current is electrons, but at low temperature (<3.8 K) it is holes which have high Hall mobilities of more than 2×10⁴ cm²/volt sec. The angular dependence of magnetoconductivities at 1.8 K shows the almost spherical shape of the constant energy surface at the top of the valence band.