“Soft”- versus “Hard” Spectroscopies for Narrow Band Materials
The knowledge of the electronic structure of intermediate valence -and heavy fermion materials is of fundamental importance to understand the thermodynamic behavior, the electrical resistivity or the magnetic properties. The quoted physical entities are heavily dependent on the electronic structure within meV around the Fermi energy Ep, especially when the electronic density of states is a strongly varying function of the energy near Ep. Present day band structure calculations are not yet able to give us an energy resolution of the order of meV1. Besides there is no simple way how to include the many body interactions of the electrons near Ep into the band structure calculation, so various ad hoc enhancement factors have do be proposed to match the calculated density of states at Ep with e.g. the measured 7 value of the specific heat.
KeywordsElectrical Resistivity Band Structure Effective Mass Fermi Energy Heavy Fermion
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