Abstract
The unusual galvanomagnetic properties of the monoclinic semimetal ${\mathrm{SrAs}}_{3}$, first-order longitudinal Hall effect and magnetoresistivity in Hall geometry, are quantitatively described within a two-band model. The ten model parameters for T\ensuremath{\rightarrow}0 K are obtained from a fit to 14 low-field coefficients in combination with high-field Hall data and Shubnikov--de Haas oscillations. The temperature variation of the galvanomagnetic coefficient can be explained most convincingly with three temperature-dependent parameters, i.e., electron and hole scattering times and electron concentration, while the anisotropy ratios are kept constant. An energy gap of 38 meV for the temperature activation of the electrons is derived from this procedure.
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