MAGNETO-OSCILLATIONS IN YBA2CU3O7-DELTA IN HIGH MAGNETIC-FIELDS

Magneto-oscillatory signals have been observed in the magnetization of samples of oriented YBa2Cu3O7-delta powders. The experiments have bee n performed in pulsed magnetic fields up to 52 T. The Fourier transfor m of these signals analyzed as a function of 1/B is dominated by two p eaks at frequencies very close to the dHvA frequencies reported by Fow ler et al. (Phys. Rev. Lett. 58, 534 (1992) ). The field dependence of the amplitude of the oscillations is in qualitative agreement with th at predicted by a recent theory of Maniv et al.