Killer U, Scheidt E-W, Eickerling G, Michor H, Sereni J, Pruschke Th, Kehrein S
CPM, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany.
Phys Rev Lett. 2004 Nov 19;93(21):216404. doi: 10.1103/PhysRevLett.93.216404. Epub 2004 Nov 16.
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.
我们报告了化合物Ce(1 - x)LaxNi9Ge4在从化学计量比系统（x = 0）到稀释极限（x = 0.95）的各种浓度下的比热、磁化率和电阻率测量结果。我们的数据揭示了与Ce浓度的单离子标度关系，并且对于化学计量比化合物x = 0，在T = 0.08 K时，电子比热Δc/T达到了有史以来记录的最大值约5.5 J K-2 mol(-1)，且没有任何磁有序的迹象。而在掺杂样品中，Δc/T在低于3 K直至50 mK的温度范围内呈对数增加，其磁化率在低于1 K时表现出费米液体的特性。这些性质使化合物Ce(1 - x)LaxNi9Ge4成为处于费米液体和非费米液体物理边界的独特体系。
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