Pseudogap Formation and Heavy-Carrier Dynamics in Intermediate-Valence YbAl3
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- Okamura Hidekazu
- Graduate School of Science and Technology, Kobe University
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- Michizawa Takahiro
- Graduate School of Science and Technology, Kobe University
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- Nanba Takao
- Graduate School of Science and Technology, Kobe University
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- Ebihara Takao
- Department of Physics, Shizuoka University
Bibliographic Information
- Other Title
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- Pseudogap Formation and Heavy-Carrier Dynamics in Intermediate-Valence YbAl<sub>3</sub>
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Abstract
Infrared optical conductivity [σ(ω)] of the intermediate-valence compound YbAl3 has been measured at temperatures 8–690 K to study its microscopic electronic structures. Despite the highly metallic characteristics of YbAl3, σ(ω) exhibits a clear pseudogap (strong depletion of spectral weight) of about 60 meV below 40 K. It also shows a strong mid-infrared peak centered at ∼0.25 eV. The energy-dependent effective mass and scattering rate of the carriers obtained from the data indicate the formation of a heavy-mass Fermi liquid. These characteristic results are discussed in terms of the hybridization states between the Yb 4f and the conduction electrons. It is argued, in particular, that the pseudogap and the mid-infrared peak result from the indirect and direct gaps, respectively, within the hybridization state.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 73 (8), 2045-2048, 2004
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679162492800
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- NII Article ID
- 210000104948
- 110001954930
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- NII Book ID
- AA00704814
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- BIBCODE
- 2004JPSJ...73.2045O
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 7051649
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed
