Magnetic Properties of Single Crystals of Ce_<i>x</i>La_1-<i>x</i>B₆

Abstract

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 x La 1- x B 6 (0.03 ≦ x ≦1.0). The magnetic phase diagram is constructed above 0.6 K for Ce 0.5 La 0.5 B 6 , Ce 0.75 La 0.25 B 6 and CeB 6 . A largely anisotropic magnetization and the temperature dependence of susceptibility in dilute alloys indicate the \(\varGamma _{8}\) quartet Kondo state contrary to the previous report. Dependence of Kondo temperature on the Ce concentration is very weak.