Origin of Middle-Infrared Peaks in Cerium Compounds(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We have demonstrated that the middle-infrared (mid-IR) peaks in the optical conductivity spectra of CeX_3 (X=Pd, Sn, In) can be explained by first-principle band structure calculation with the spin-orbit interaction. The mid-IR peak shapes in these materials are not identical to one another: CePd_3, CeSn_3, and CeIn_3 have a triple-peak structure, a double-peak structure, and a broad single-peak structure, respectively. These peaks can be theoretically explained by the optical transition from the occupied state to the spin-orbit splitted Ce 4f state. This result indicates that the mid-IR peaks originate from the simple band picture with the Ce 4f state near the Fermi level, not from the conventional cf hybridization gap based on the periodic Anderson model.
社団法人日本物理学会の論文
2009-01-15