4f-5d Exchange Interaction and Magnetic Circular Dichroism in L_<2, 3> Absorption for Ferromagnetic Rare Earths
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概要
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We give an interpretation for the observed systematic trend of magnetic circular dichroism (MCD) in L_<2, 3> photoabsorption of rare-earth (RE) atoms from Ce to Tm in ferro- or ferrimagnetic RE_2Co_<17> assuming the 2p→5d electric dipole transition. We assume that the 4f state of trivalent RE ions is in the polarized Hund-ground-state. We then take into account the spin and orbital magnetic moments induced in the RE 5d state through the intraatomic 4f-5d exchange interaction approximated by a molecular field with assuming a band width of several eV and one tenth filling of the 5d band. The integrated MCD intensity calculated with a naive one-electron picture is shown to correspond well to the observed trend. The 5d orbital moment estimated both from the present model and from a MCD sum rule applied to the experiment is of the order of 〜0.1 μ_B, which is comparable to the 5d spin moment.
- 社団法人日本物理学会の論文
- 1993-10-15
著者
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Jo T
Department Of Quantum Matter Adsm Hiroshima University
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Jo Takeo
Department Of Materials Science Faculty Of Science Hiroshima University
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Imada Shin
Department Of Material Physics Faculty Of Engineering Science Osaka University
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