Unusual single-ion non-fermi-liquid behavior in Ce(1-x)LaxNi9Ge4.
Unusual single-ion non-fermi-liquid behavior in Ce(1-x)LaxNi9Ge4.
复制标题
Ce(1-x)LaxNi9Ge4 中不寻常的单离子非费米液体行为。
DOI：
10.1103/physrevlett.93.216404
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发表时间：
2004
影响因子：
8.6
通讯作者：
S. Kehrein
中科院分区：
文献类型：
--
作者：
U. Killer;Ernst;G. Eickerling;H. Michor;J. Sereni;Thomas Pruschke;S. Kehrein
我们报道了化合物Ce(1-x)LaxNi9Ge4在不同浓度下的比热、磁化率和电阻率的测量，从x = 0的化学计量体系到x = 0.95的稀释极限。我们的数据揭示了单离子随Ce浓度的缩放，并且在T = 0.08 K时，化学计量化合物x = 0的电子比热δ tac/T的最大记录值约为5.5 J K-2 mol(-1)，而没有任何磁序的痕迹。而在掺杂样品中，δ tac/T在3k以下呈对数增长至50 mK，其磁化率在1 K以下表现为费米液体。这些性质使化合物Ce(1-x)LaxNi9Ge4成为费米液体和非费米液体物理边界上的独特体系。
We report on specific heat, magnetic susceptibility, and resistivity measurements on the compound Ce(1-x)LaxNi9Ge4 for various concentrations ranging from the stoichiometric system with x = 0 to the dilute limit x = 0.95. Our data reveal single-ion scaling with the Ce concentration and the largest ever recorded value of the electronic specific heat Deltac/T approximately 5.5 J K-2 mol(-1) at T = 0.08 K for the stoichiometric compound x = 0 without any trace of magnetic order. While in the doped samples Deltac/T increases logarithmically below 3 K down to 50 mK, their magnetic susceptibility behaves Fermi-liquid-like below 1 K. These properties make the compound Ce(1-x)LaxNi9Ge4 a unique system on the borderline between Fermi-liquid and non-Fermi-liquid physics.