Beats of quantum oscillations of the Hall coefficient and resistivity in semiconductor alloys $n$-Bi$_{0.93}$Sb$_{0.07}$ at a small deviation of the magnetic field direction from the trigonal axis

Quantum oscillations of the resistivity $\rho_{22}$ and Hall coefficient $R_{12.3}$ in the semiconductor alloy $n$-Bi$_{0.93}$Sb$_{0.07}$ have been studied at $H\parallel C_3$ and $j\parallel C_1$ in magnetic fields to 14 T and at temperatures of 1.5, 4.5, 10, and 20 K. At temperatures of 1.5 and 4.5 K, beats of quantum oscillations of $\rho_{22}$ and $R_{12.3}$ due to a small deviation of the magnetic field $H$ from the crystallographic $C_3$ axis have been observed. To determine the oscillation period $\Delta_i$, cyclotron mass $m_{ci}$, cyclotron frequency $\omega_{ci}$, and extreme section $S_{\mathrm{extri}}$, experimentally measured quantum oscillation beats have been compared with the model beats of oscillations of three harmonic functions, two of which have close frequencies. The deviation of the parameters $\Delta_i$, $m_{ci}$, and $S_{\mathrm{extri}}$ from the same parameters when the magnetic field $H$ exactly coincides with the trigonal $C_3$ axis has made it possible to estimate the magnetic field $H$ deflection angle from the trigonal $C_3$ axis, which is $\sim$1$^\circ$.