Abstract
Quantum oscillations in the attenuation of 300 MHz transverse ultrasonic waves have been measured at 1·2°K in single crystals of chromium which were previously cooled through the Neel temperature in the presence of a 55 kG magnetic field directed along one of the [100] crystalline axes (field-cooling). Frequencies of the quantum oscillations were determined at 5 deg intervals in each of two major planes by computer analysis of the data between 38 and 49 kG. The variation of quantum oscillation frequencies as the relative angle between the measuring field direction and crystalline axes varied was found to be consistent with the picture that field-cooling produces a single antiferromagnetic domain state and showed that the Fermi surface of chromium is considerably altered by the onset of antiferromagnetism. Several quantum oscillation frequencies have values equal to integral multiples of one particular frequency branch. Other branches appear to have frequencies equal to the sums of pairs of lower frequencies. Discussion of these results is presented.
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