Appearance of the crystal field levels with conduction electrons in Tm0.05LaxYb0.95-xTe

The local electronic states of Tm ions in Tm0.05LaxYb0.95-xTe have been investigated for x=0.95, 0.75 and 0.55, where the number of conduction electrons and the crystalline electric field (CEF) states varies with x. The results of neutron scattering and specific heat show that the well-defined CEF levels at x=0.95 decays with decreasing x. At x=0.55 the CEF almost vanishes and a quasi-elastic scattering appears. The analysis of the specific heat for x=0.55 also indicates a continuous density of states of the ground state