AI Article Synopsis
- The study investigates the changes in the electronic structure of the Kondo semiconductor CeOs(2)Al(10) as it transitions through an unusual antiferromagnetic ordering temperature (T(0)) of 29 K using optical conductivity measurements.
- Measurements along the a and c axes reveal a continuous emergence of a c-f hybridization energy gap with increasing temperature, while the b axis shows a different energy gap forming at 39 K that is fully established at T(0) due to charge instability.
- The findings suggest that the emergence of energy gaps and alterations in the electronic structure, particularly along the b axis, are linked to the onset of antiferromagnetic ordering below T(0).
Article Abstract
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).
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| http://dx.doi.org/10.1103/PhysRevLett.106.056404 | DOI Listing |
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