Abstract
The temperature dependences of the Yb 4f and 3d states of Kondo semiconductor YbB 12 single crystal have been studied by high-resolution photoemission spectroscopy taken at hν=100 and 5951 eV. The Yb 2+4f 7/2 state at the Fermi level is enhanced on cooling. With improved energy resolution, we discover an additional quasi-particle peak at 15 meV that developes below 60 K. From the Yb 3d spectrum at 22 K, the Yb valence is estimated to be∼2.88.
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