The bandstructure of rhodium, its groundstate and the effects of change of volume

Bandstructure calculations have been carried out for rhodium for the normal value of the lattice constant and one 5% larger, using Hubbard's method (1969). The results of the first calculation compare well with those of other workers and with X-ray photoemission measurements, while comparison with specific heat measurements suggest an electron-phonon interaction enhancement parameter lambda of 0.48. The approximate theory of Ratti and co-workers (1974) gives a much lower value of lambda =0.22 and comparison with experiment of the corresponding values predicted for the superconducting transition temperature T c fails to decide between the two values. From the two band calculations values are calculated for dT c /dV and it is predicted qualitatively that T c will increase under pressure. With regard to the magnetic character of the groundstate it is confirmed that this will not be ferromagnetic according to the Stoner criterion, even in the expanded state.