De Haas--van Alphen effect and Fermi surface of YBa sub 2 Cu sub 3 O sub 6. 97
The component of the magnetic susceptibility periodic in 1/{ital B}, the de Haas--van Alphen effect, has been investigated using a 100-T flux compression system. It is concluded from these measurements that YBa{sub 2}Cu{sub 3}O{sub 6.97} exhibits a Fermi surface with at least three separate extremal frequencies for the {ital c} axis parallel to the applied field. Orbital masses, renormalization {lambda}'s, and scattering rates are estimated from an amplitude analysis.