Theoretical Calculation for the Fermi Surface Structures of CeSb in the Ferromagnetic and Ferromagnetic AFF1 Phases : Condensed Matter: Electronic Properties, etc.

概要

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The Fermi surface structures of CeSb in the ferromagnetic (F) phase and in the ferrimagnetic AFF1 phase are studied. The p-f mixing model explains various anomalous magnetic properties of this compound and predicts the β_4 hole surface in the F phase. But the β_4 surface in the previous calculation has the discrepancy from the observations of the de Haas-van Alphen effects. The fully polarized |j = 5/2, j_z = 5/2> state has been assumed as the occupied orbit of the 4f state. We show that the discrepancy is largely reduced when the occupied 4f state has a little more amplitude of a Γ_7 component than the fully polarized state, although unresolved deviation still remains. The calculated Fermi surfaces of the AFF1 phase explain well the experimental results. The β_4 surface in the F phase changes to the folded and open structure in the AFF1 phase showing new extremal areas. It is shown that the β_4 surface has a very anisotropic mass enhancement factor, which is consistent with the p-f mixing model. As the mechanism to improve the agreement, various types of many body effects are discussed.
社団法人日本物理学会の論文
2000-08-15