Two complementary analyses for the electronic structure of Ce systems are given. The first is performed from the renormalized density of states (DOS) deduced from the interacting Green’s functions. These Green’s functions are obtained from a self-energy calculated from a multiband Hubbard Hamiltonian and using the random phase approximation to account for the dynamical (Formula presented)-(Formula presented) screened interactions. The resulting DOS presents agreements and discrepancies with the spectral data yielded by direct and inverse photoemission. The theoretical and experimental (Formula presented) widths next to the Fermi level imply (Formula presented)-electron masses that are in strong contradiction with those obtained from the heavy-fermion specific heat. We have carried out a second analysis that complements the first one, since it considers the spin-exchange between extended states and a spin-field that is completely excluded from the first calculation. By the marriage of the results obtained in the first calculation with those of the second analysis, we can relate the photoemission spectra and de Haas-van Alphen masses with the measurements of the contribution of the low-energy quasiparticles to the specific heat and the magnetic susceptibility. © 1997 The American Physical Society.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1 Jan 1997|