Double 4f collapse in óÅ0.9YbxTh0.1
Smirnov Yu. P. , Sovestnov A. E., Terekhov G. I. , Tyunis A. V. , Shaburov V. A.
Simultaneous sharp changes in the energy of ë x-ray lines of Ce and Yb have been observed experimentally in Ce0 9 x Ybx Th0,. These changes are reversible as the temperature is varied. The effect is shown to be due to a derealization of 4f electrons of Ce and Yb (the electronic transitions Ce3+, 4/l-Ce4+, 4/°, Yb2+, 4/14Yb3+,4/13).