Abstract
We have studied the de Haas-van Alphen effect in spherical nickel crystals in fields up to 63 kOe and at temperatures as low as 1.1° K using a low frequency ( 40 Hz) field modulation technique. Our measure ments showed that the field modulation technique could be used for ferro magnetic samples provided that the modulation frequency was less than 25 kHz and that the modulation field was parallel to the applied field direction. The observed de Haas-van Alphen oscillations are interpreted as arising from two distinct sheets of Fermi surface — one, a multiplyconnected copper-like sheet centered at the point P in the zone and the other a set of equivalent fluted ellipsoids situated at the symmetry points X in the zone. We have interpreted these surfaces in terms of the band structure predicted by L. Hodges and have shown that our measurements are in complete accord with these new calculations.
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