The Fermi surface of ordered Cd3Mg has been studied by using the DHVA effect. Eighteen separate DHVA frequency branches were observed and the frequencies ranged from 2*105 G to 4*107 G. The abundant branches observed are associated with the superlattice structure of Cd3Mg. The overall features of the Fermi surface of Cd3Mg are relatively simple and resemble those of the Fermi surface of Mg rather than Cd; the third-zone electron surface centred at the K point, the third- and fourth-zone electron surfaces around the L point and the so called monster waist all exist in Cd3Mg. However, the dimensions of these Fermi surfaces are about half those in Mg.
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