Physical Mechanism in Kondo Insulator
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概要
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Physical mechanism in Kondo insulator with nearly homogeneous energy gap is studied basedon the model for the valence fluctuation regime in which the mixing band electron is of localizedcharacter and the first excited state is a .s-wave exciton. This model is applied to new experi-mental studies by the inelastic neutron scattering in SrnB5 and YbB)z, as well as their alloys.Therefore, the present model is based on the effective one site Kondo state model. The Luttingertheorem is also critically studied on this stand point. Detailed q-dependence of the .s-wave exciton peak in SIl1B6 is calculated based on the present model. Good agreement is obtained eventhough there is no adjustable parameter. In particular, two peak structure along both [1114 and[0114 directions with the intensity ratio of 3:l, as well as the sharp q dependences are explainedvery well. Anomalous behaviors in the alloy systems are also well explained based on the presentmodel.
- 社団法人日本物理学会の論文
- 1996-08-15
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