Low-Temperature Thermal Expansion ofV3Si

Measurements are described of the thermal expansion $\alpha$ of two samples of ${\mathrm{V}}_3$Si. One shows a large anomaly in $\alpha$ resulting from the structural transformation, which starts above 30°K and continues below the superconducting transition temperature $T_c$. The other sample shows only about 1% structural transformation, and the associated anisotropy in the discontinuity of $\alpha$ at $T_c$ shows that quadratic terms in the strain dependence of $T_c$ are unusually large.