Abstract
Attenuation of an ultrasonic wave near the spin-flop transition point in uniaxial antiferromagnets is studied theoretically. The modulation of the exchange interaction caused by lattice vibrations is considered as the interaction between a sound wave and the spins. An anomalous increase in the attenuation against an external magnetic field at a fixed temperature near the spin-flop transition point is obtained for both longitudinal and transverse sound waves. This removes a discrepancy between recent experiments and previous theories. A sharp dependence of the attenuation on the angle between the easy axis of a crystal and a magnetic field is also obtained in agreement with the experiments.
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