In order to study the mechanism underlying the mass enhancement in heavy-fermion compounds in the presence of a magnetic field, we study the periodic Anderson model by using the fluctuation exchange approximation. The resulting mass enhancement factor can have a value up to 10, which is significantly larger than that in the single-band Hubbard model. We show that the difference between the magnitude of the mass enhancement factor of up-spin (minority spin) electrons z↑-1 and that of down-spin (majority spin) electrons z↓-1 increases with the applied magnetic field B ∥ z, which is consistent with the de Haas-van Alphen measurements for CeCoIn5, CeRu2Si2, and CePd2Si2. We predict that z↑-1 > z↓-1 in many Ce compounds, whereas z ↑-1 < z↓-1 in Yb compounds.
- Periodic Anderson model
ASJC Scopus subject areas
- General Physics and Astronomy