Magnetic Properties of Single Crystals of Ce_xLa_1−xB₆

抄録

Measurements of the magnetization process at 4.2 K and 1.3 K for magnetic field up to about 150 kOe and of the temperature dependence of the susceptibility between 4.2 K and room temperature have been done in order to investigate Kondo states of dilute and dense Kondo system in single crystalline Ce_xLa_1−xB₆ (0.03≤x≤1.0). The magnetic phase diagram is constructed above 0.6 K for Ce_0.5La_0.5B₆, Ce_0.75La_0.25B₆ and CeB₆. A largely anisotropic magnetization and the temperature dependence of susceptibility in dilute alloys indicate the Γ₈ quartet Kondo state contrary to the previous report. Dependence of Kondo temperature on the Ce concentration is very weak.