Magnetoresistance of the quasi-one-dimensional conductor NbSe$_3$ with a charge density wave in magnetic fields of different orientations

The magnetoresistance of NbSe$_3$ single crystals is measured as a function of magnetic field for different field orientations. A possibility of studying the Fermi surface by using the dependence of the Shubnikov-de Haas oscillation phase on the rotation angle of the magnetic field is demonstrated. The results of the study show that the quasi-momenta of carriers that are not condensed in the charge density wave are predominantly oriented along the conducting chains.