Enhancement of the Sum and Difference Frequencies in Shubnikov-de Haas Oscillation at Yamaji Angle in the Layered Perovskite Sr₂RuO₄

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With regard to the Shubnikov-de Haas oscillations in Sr₂RuO₄, an unusual enhancement was found in oscillatory components with frequencies F_{β ± α}=F_β ± F_α for a particular orientation of the crystal in the magnetic field, where F_α and F_β are the oscillatory frequencies for the two-dimensional Fermi surface branches, α and β, respectively. The orientation is given by the so-called Yamaji angles corresponding to the maxima in the angle-dependent magnetoresistance oscillation, where the carriers inthe slightly warped cylindrical Fermi surface behave as if they were in a two-dimensional system. The results can be understood in terms of the chemical potential oscillation effect as predicted by Nakano for de Haas-van Alphen oscillations.