High-resolution photoemission study of the temperature-dependent c-f hybridization gap in the Kondo semiconductor YbB12
Physical Review B Volume 73
Page 033202-
published_at 2006
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Title ( eng ) |
High-resolution photoemission study of the temperature-dependent c-f hybridization gap in the Kondo semiconductor YbB12
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Creator |
Takeda Yukiharu
Arita Masashi
Higashiguchi Mitsuharu
Iga Fumitoshi
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Source Title |
Physical Review B
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Volume | 73 |
Start Page | 033202 |
Abstract |
The temperature-dependent metal-to-insulator transition in the Kondo semiconductor YbB12 single crystal has been studied by means of high-resolution photoemission spectroscopy with a tunable photon energy. An energy gap in the valence band is gradually formed below T1~150 K, and at the same time, the Yb 4f7/2 Kondo peak at 55 meV grows and shifts to a lower binding energy. Below T2~60 K, an additional spectral feature at 15 meV becomes apparent in the Yb 4f and Yb 5d derived spectra, indicating a strongly hybridized character. The 15 meV feature in the Yb 4f derived spectra is intense at the L point of the Brillouin zone and diminishes away from the L point. These results indicate that the energy gap is formed by the hybridization between the Yb 4f and Yb 5d states.
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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 | 2006 |
Rights |
Copyright (c) 2006 American Physical Society
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Publish Type | Version of Record |
Access Rights | open access |
Source Identifier |
[ISSN] 1098-0121
[NCID] AA11187113
[DOI] 10.1103/PhysRevB.73.033202
[DOI] http://dx.doi.org/10.1103/PhysRevB.73.033202
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