†37 †38 †39 †40 †T9

The three elastic coefficients C=C44, C′=(C11–C12)/2, and CL=(C11+C12+2C44)/2, for Ag and Au were measured over the range 4.2 K < T < 300 K. Data are plotted and tabulated. Debye characteristic temperatures obtained from the elastic constants are in good agreement with results from calorimetry.