Temperature-Dependent High-Resolution Photoemission Study of the Kondo Insulator YbB12
PhysRevLett_82_992.pdf 98.4 KB
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.
Physical Review Letters
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American Physical Society
Copyright (c) 1999 American Physical Society.
Graduate School of Science
Graduate School of Advanced Sciences of Matter
Hiroshima Synchrotron Radiation Center