Abstract
Ultrasonic wave velocities have been measured in SnTe single crystals with hole concentrations of 1.0 and 4.5 × 10 20/cm 3. The shear elastic stiffness constant C 44 is sensitive to the hole concentration but 1 2 (C 11 − C 12) is not, a result which is consistent with the valence band pockets being sited at the L points. The non-ellipsoidal, non-parabolic multivalley band model has been used to calculate the hole contribution to the elastic constants. The calculated difference between the shear constant C 44 (2.78 × 10 10 dyne cm -2) for the two crystals is in agreement with that measured experimentally (2.67 × 10 10 dyne cm -2). The shear deformation potential constant E u for the SnTe valence band is 7.8 eV at 293°K.
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