A dilute limit of CeAl$_3$: Emergence of the single-ion Kondo scaling

Details A dilute limit of CeAl$_3$: Emergence of the single-ion Kondo scaling A dilute limit of CeAl$_3$: Emergence of the single-ion Kondo scaling

2004-04-26

arxiv.org/abs/cond-mat/0404595v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

Strongly diluted Ce$_x$La$_{1-x}$Al$_3$ alloys have been studied by the low temperature specific heat in order to elucidate the mechanism that determine their ground state. All alloys with Ce concentrations of $0.0005 \leq x \leq 0.1$ show a $S=1/2$ Kondo behavior. However, the single-ion scaling is observed only below $x=0.01$. The true single-ion Kondo temperature is small, 0.2 K, and is identical to that for dilute CeAl$_2$. It is about 20 times smaller than that for CeAl$_3$, indicating that intersite interactions facilitate Kondo-screening in CeAl$_3$ and concentrated Ce$_x$La$_{1-x}$Al$_3$ alloys.

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