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ID 14990
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creator
Takeda, Yukiharu
Arita, Masashi
Higashiguchi, Mitsuharu
Iga, Fumitoshi
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.
journal title
Physical Review B
volume
Volume 73
start page
033202
date of issued
2006
publisher
American Physical Society
issn
1098-0121
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2006 American Physical Society
relation is version of URL
http://dx.doi.org/10.1103/PhysRevB.73.033202
department
Graduate School of Integrated Arts and Sciences
Graduate School of Advanced Sciences of Matter
Hiroshima Synchrotron Radiation Center