Galvanomagnetic and Thermomagnetic Potentials in Zinc at Liquid Helium Temperatures

The Hall effect, magnetoresistance, thermoelectric voltage, and transverse Ettingshausen-Nernst potential have been measured in a single crystal of zinc in the liquid helium temperature range. Oscillations as a function of magnetic field strength were observed in all of these potentials. The measured period in 1/H for the transverse oscillations was 6.2×{}10^-5 gauss^-1±{}0.5%, with the magnetic field parallel to the hexagonal axis. Both transverse effects possessed strong second harmonic oscillations. The oscillations in the longitudinal effects both exhibited a phase inversion in the neighborhood of 4.2 kgauss, the same field region for which the gross Hall field changed sign. In this same field region the period of the oscillations for the longitudinal effects was that of the second harmonic.Empirical correlations between the reversal of sign of the Hall effect and: (1) the phase reversal of the magnetoresistance oscillations, (2) the strong second harmonic content of these oscillations in the region of the phase reversal, and (3) the quadratic shape of the envelope of the magnetoresistance oscillations in this region can be achieved by assuming the oscillatory component of σ₂₁ to be much more significant than that of σ₁₁, where σᵢₖ is the conductivity tensor.A further correlation between the oscillatory thermal effects can be achieved by assuming that the difference of the absolute thermoelectric power and the temperature derivative of the chemical potential is negligible.