Magnetoconductivity of Trigonal Selenium Single Crystals

Six of the eight magnetoconductivity components of trigonal Se are measured up to 30 kG over the temperature range 83 to 300 °K. Unlike the Hall mobility, which increases exponentially with temperature, the magnetoconductivity mobility decreases with rising temperature and, at high temperatures, is approximately proportional to T−3/2. At 300 °K a value of 28 cm2/Vs is obtained for the mobility in the chain direction, whilst the Hall mobility at the same temperature is only about 0,2 cm2/Vs[1]. This discrepancy can be explained by assuming a strongly inhomogeneous hole concentration. The directional dependence of the magnetoconductivity is interpreted using a six‐ellipsoidal model. From this the ratio of the mobilities parallel and perpendicular to the chain direction is about 3.5.