Temperature-Dependent High-Resolution Photoemission Study of the Kondo Insulator YbB12

Physical Review Letters Volume 82 Issue 5 Page 992-995 published_at 1999-02-01
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Title ( eng )
Temperature-Dependent High-Resolution Photoemission Study of the Kondo Insulator YbB12
Creator
Susaki Tomofumi
Takeda Yukiharu
Arita Masashi
Mamiya Kazutoshi
Fujimori Atsushi
Shimizu Naoki
Iga Fumitoshi
Source Title
Physical Review Letters
Volume 82
Issue 5
Start Page 992
End Page 995
Abstract
We have performed a detailed temperature-dependent photoemission study of the conduction-band states in the Kondo insulator YbB12 using single crystalline samples. Measurements with improved energy resolution have revealed (pseudo)gaps of two energy scales. The size of the narrower gap ~10 meV and its disappearance at high temperatures are consistent with the temperature dependence of the electrical resistivity and the magnetic susceptibility. The larger pseudogap of ~100 meV depends on temperature even at room temperature. We discuss how the characteristics of the Kondo insulator are reflected in the conduction-band photoemission spectra.
Language
eng
Resource Type journal article
Publisher
American Physical Society
Date of Issued 1999-02-01
Rights
Copyright (c) 1999 American Physical Society.
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.82.992
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.82.992