2006
DOI: 10.1103/physrevb.73.033202
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Abstract: The temperature-dependent metal-to-insulator transition in the Kondo semiconductor YbB 12 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 T 1 ϳ 150 K, and at the same time, the Yb 4f 7/2 Kondo peak at 55 meV grows and shifts to a lower binding energy. Below T 2 ϳ 60 K, an additional spectral feature at 15 meV becomes apparent in the Yb 4f and Yb 5d derived spectra, indicating a stro…

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