Optical conductivity of the Kondo insulator YbB12 : Gap formation and low-energy excitations
Physical Review B - Condensed Matter and Materials Physics Volume 58 Issue 12
Page R7496-R7499
published_at 1998-09-15
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| File | |
| Title ( eng ) |
Optical conductivity of the Kondo insulator YbB12 : Gap formation and low-energy excitations
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| Creator |
Okamura Hidekazu
Kimura Shinichi
Shinozaki H.
Nanba Takao
Iga Fumitoshi
Shimizu Naoki
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| Source Title |
Physical Review B - Condensed Matter and Materials Physics
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| Volume | 58 |
| Issue | 12 |
| Start Page | R7496 |
| End Page | R7499 |
| Abstract |
Optical reflectivity experiments have been conducted on single crystals of the Kondo insulator YbB12 in order to obtain its optical conductivity, σ(ω). Upon cooling below 70 K, a strong suppression of σ(ω) is seen in the far-infrared region, indicating the opening of an energy gap of ∼25 meV. This gap development is coincident with a rapid decrease in the magnetic susceptibility, which shows that the gap opening has significant influence on magnetic properties. A narrow, asymmetric peak is observed at ∼40 meV in σ(ω), which is attributed to optical transitions between the Yb 4f-derived states across the gap. In addition, a broad peak is observed at ∼0.25 eV. This peak is attributed to transitions between Yb 4f-derived states and the p-d band, and is reminiscent of similar peaks previously observed for rare-earth hexaborides.
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
American Physical Society
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| Date of Issued | 1998-09-15 |
| Rights |
Copyright (c) 1998 American Physical Society.
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[ISSN] 0163-1829
[DOI] 10.1103/PhysRevB.58.R7496
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.58.R7496
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