By straightforward extension of the pseudopotential model which was originally developed for pure beryllium at 0°K, it is shown how to obtain the changes in the Fermi surface with temperature. Because of the very high Debye temperature of Be, the changes even at room temperature are not large. In particular, the calculations show that there are no changes in topology of the Fermi surface with rise in temperature and that the probability of breakdown between orbits in a magnetic field is not significantly enhanced.

• Received 23 September 1969

DOI:https://doi.org/10.1103/PhysRevB.1.550