Temperature-Dependent High-Resolution Photoemission Study of the Kondo Insulator YbB12
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概要
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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.
- 1999-02-01
著者
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高畠 敏郎
Department Of Quantum Matter Adsm Hiroshima University:institute For Advanced Materials Research Hir
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Shimada Kenya
Hiroshima Univ. Hiroshima Jpn
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Arita M
Hiroshima Synchrotron Radiation Center Hiroshima University
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Kawashima Miho
Synchrotron Radiation Research Center Japan Atomic Energy Agency:(present Office)ulvac-phi Inc.
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Susaki Tomofumi
Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo:(pres
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Fujimori Atsushi
Synchrotron Radiation Research Center Japan Atomic Energy Agency:department Of Physics University Of
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Shimizu Naoki
Department Of Quantum Matter Adsm Hiroshima University
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