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
アクセス数 : 820 件
ダウンロード数 : 211 件
今月のアクセス数 : 0 件
今月のダウンロード数 : 1 件
この文献の参照には次のURLをご利用ください : https://ir.lib.hiroshima-u.ac.jp/00018730
| File | |
| Title ( eng ) |
Optical conductivity of the Kondo insulator YbB12 : Gap formation and low-energy excitations
|
| Creator |
Okamura Hidekazu
Kimura Shinichi
Shinozaki H.
Nanba Takao
Iga Fumitoshi
Shimizu Naoki
|
| Source Title |
Physical Review B - Condensed Matter and Materials Physics
|
| 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.
|
| Language |
eng
|
| Resource Type | journal article |
| Publisher |
American Physical Society
|
| Date of Issued | 1998-09-15 |
| Rights |
Copyright (c) 1998 American Physical Society.
|
| 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
|
