Longitudinal magnetostriction of bismuth above the last quantum limit

The longitudinal magnetostriction of Bi has been measured in the bisectrix direction up to 5 T, at 4.2K and 2K. It is found that, above the last quantum limit, when the oscillatory magnetostriction vanishes, the negative induced strain displays a monotonic increase against field. This behaviour is ascribed to the change of carrier population in the different Fermi pockets of bismuth, in agreement with the known high-field band model and the deformation potential theory.