Can Competition between the crystal field and the Kondo effect cause non-Fermi-liquid-like behavior?
Can Competition between the crystal field and the Kondo effect cause non-Fermi-liquid-like behavior?
复制标题
晶体场和近藤效应之间的竞争会导致非费米液体行为吗？
DOI：
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发表时间：
2005
影响因子：
8.6
通讯作者：
T. Pruschke
中科院分区：
文献类型：
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作者：
F. Anders;T. Pruschke
最近报道的Ce（1-x）La（x）Ni 9 Ge 4的静态和动态磁化率以及比热的不寻常行为提出了这种材料中可能存在非费米液体基态的问题。我们认为，一个一致的物理图像的晶体场分裂的两个低洼的Ce 4f-壳层的磁偶极子必须考虑在内。此外，我们还发现当低温标度T* 分裂时，SU（4）和SU（2）Kondo效应之间存在交叉行为，这两种双重态的屏蔽作用发生在不同的温度标度上，从而导致低温下磁化率和比热的不同行为.实验上可达到的温度制度下降到50 mK仍然是在扩展的交叉制度到一个强耦合费米液体固定点。
The recently reported unusual behavior of the static and dynamical magnetic susceptibility as well as the specific heat in Ce(1-x)La(x)Ni9Ge4 has raised the question of a possible non-Fermi-liquid ground state in this material. We argue that for a consistent physical picture the crystal-field splitting of two low-lying magnetic doublets of the Ce 4f-shell must be taken into account. Furthermore, we show that for a splitting of the order of the low temperature scale T* of the system a crossover behavior between an SU(4) and an SU(2) Kondo effect is found. The screening of the two doublets occurs on different temperature scales leading to a different behavior of the magnetic susceptibility and the specific heat at low temperatures. The experimentally accessible temperature regime down to 50 mK still lies in the extended crossover regime into a strong-coupling Fermi-liquid fixed point.