Abstract
We have studied the coexistence and the competition between the Kondo singlet state and the long-range antiferro(AF)magnetic ordering in the Ce x Nd 1- x B 6 system. At high temperatures, the single impurity Kondo effect is observed in all the samples as in the Ce x La 1- x B 6 system. In the AF magnetic state formed mainly by Nd ions, Ce ions contribute to the AF magnetic ordering but at the same time exhibit the Kondo singlet character with a small effect from the magnetic ordering. The ground state of Ce x Nd 1- x B 6 changes with x ; in a small x region, the Kondo singlet state is destroyed by the exchange field from surrounding Nd moments. Above x ∼0.3, the long-range magnetic order takes place because the Ce–Ce interaction overcomes the Kondo effect. In an intermediate x value between the above two regions, the Kondo singlet state may continue to exist down to a very low temperature.
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