The high-field magnetoresistance of Be exhibits large-amplitude quantum oscillations as a function of magnetic field for the field parallel to the hexagonal axis. A low frequency, which appears only at temperatures below 4.2°K, cannot be related to a Fermi-surface area. It is demonstrated how this frequency is generated through the interaction of magnetic breakdown and the magnetic domains reported by Condon.

• Received 7 November 1969

DOI:https://doi.org/10.1103/PhysRevB.1.3504