Fermi Surfaces of Potassium and Rubidium

Experimental data on the shapes of the Fermi surfaces of K and Rb are used to determine the first two Fourier coefficients of the effective potential in the metals for scattering at the Fermi energy. Band-structure contributions to the specific-heat masses and cyclotron masses are deduced using the empirical values of the band gaps. Addition of mass-enhancement terms arising from electron-electron and electron-phonon interactions gives fair agreement with experiment.