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VOLUME 30 (1979) | ISSUE 4 | PAGE 222
Spiral cyclotron waves in metals with an open Fermi surface
A new type of electromagnetic excitations in gallium—spiral cyclotron waves— were investigated theoretically and experimentally. They propagate in the open directions and are polarized in the same way as helicons in uncompensated metals. The spiral waves can be effectively excited by longitudinal ultrasound.