Abstract
The elastic moduli of a single crystal of stoichiometric $\ensuremath{\beta}\ensuremath{-}\mathrm{CuZn}$ have been measured as a function of temperature in the range 4.2 to 800\ifmmode^\circ\else\textdegree\fi{}K. The temperature variation was found to be normal for all elastic constants. In particular, ${c}_{11}$ is unchanged on passing through the critical temperature ${T}_{c}$, while the shear constants $C$ and ${C}^{\ensuremath{'}}$ exhibit a substantial change at ${T}_{c}$. This change is consistent with the configurational change due to disordering.Measurements were also made on the composition dependence of the room-temperature elastic constants in the $\ensuremath{\beta}$ field. A large variation with composition was found, amounting to almost 100% for the shear constant ${C}^{\ensuremath{'}}$. This behavior is in qualitative agreement with theory, and suggests substantial contributions to the elastic moduli from second-neighbor interactions and the Fermi surface overlap.
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