Electronic-structure-driven magnetic ordering in a Kondo semiconductor CeOs2Al10

We report the anisotropic changes in the electronic structure of a Kondo semiconductor CeOs(2)Al(10) across an anomalous antiferromagnetic ordering temperature (T(0)) of 29 K, using optical conductivity spectra. The spectra along the a and c axes indicate that an energy gap due to the hybridization...

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Bibliographic Details
Published in:Physical review letters 2011-02, Vol.106 (5), p.056404-056404
Main Authors: Kimura, Shin-ichi, Iizuka, Takuya, Miyazaki, Hidetoshi, Irizawa, Akinori, Muro, Yuji, Takabatake, Toshiro
Format: Article
Language:English
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Summary:We report the anisotropic changes in the electronic structure of a Kondo semiconductor CeOs(2)Al(10) across an anomalous antiferromagnetic ordering temperature (T(0)) of 29 K, using optical conductivity spectra. The spectra along the a and c axes indicate that an energy gap due to the hybridization between conduction bands and nearly local 4f states, namely the c-f hybridization gap, emerges from a higher temperature continuously across T(0). Along the b axis, on the other hand, another energy gap with a peak at 20 meV becomes visible at 39 K (>T(0)) and fully opens at T(0) because of a charge instability. This result implies that the appearance of the energy gap, as well as the change in the electronic structure along the b axis, induces the antiferromagnetic ordering below T(0).
ISSN:1079-7114
DOI:10.1103/PhysRevLett.106.056404