Magneto-oscillations in YBa2Cu3O7-δ in high magnetic fields

Abstract Magneto-oscillatory signals have been observed in the magnetization of samples of oriented YBa 2 Cu 3 O 7− δ powders. The experiments have been performed in pulsed magnetic fields up to 52 T. The Fourier transform of these signals analyzed as a function of 1/ B is dominated by two peaks at frequencies very close to the dHvA frequencies reported by Fowler et al. (Phys. Rev. Lett. 58 , 534 (1992)). The field dependence of the amplitude of the oscillations is in qualitative agreement with that predicted by a recent theory of Maniv et al .