Abstract
The effect of the change in easy direction of magnetization on the elastic constants ${c}_{33}$ and ${c}_{44}$ has been measured in single-crystal gadolinium by means of a pulse-echo technique. One of the constants ${c}_{33}$ exhibited a sharp decrease of about 2% over the temperature range -37 to -51\ifmmode^\circ\else\textdegree\fi{}C after which it slowly returned to its normal, monotonic increasing behavior with decreasing temperature. Magnetic fields of up to 8 kOe, either parallel or perpendicular to the unique axis of the hexagonal crystal, were applied to the sample. These decreased the absolute magnitude of the change in ${c}_{33}$. It is thought that the acoustic wave is coupled to the spin structure by volume magnetostriction.
Published Version
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