Abstract
We have measured photoemission spectra of a single crystal YbB 12, which is known to be a Kondo insulator, with high energy resolution at 700 eV in the temperature range between 200 and 20 K to study the Kondo resonance behavior in the bulk. The sharp bulk Yb 2+ 4f 13 peaks observed on fractured YbB 12, which is only weakly influenced by the surface electronic structures, facilitate high accuracy evaluation of the temperature dependences of the Kondo peak energy and the bulk valence.
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