Influence of competing energy scales on the effective spin degeneracy in CeNi9−xFexGe4

Influence of competing energy scales on the effective spin degeneracy in CeNi9−xFexGe4
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竞争能量尺度对 CeNi9âxFexGe4 有效自旋简并性的影响

DOI:
10.1016/j.jallcom.2012.01.001
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发表时间:
2012
影响因子:
6.2
通讯作者:
E-W. Scheidt
E-W. Scheidt
中科院分区:
材料科学2区
文献类型:
--
作者:
C. Gold;M. Uffinger;M. Herzinger;G. Eickerling;W. Scherer;H. Michor;E-W. Scheidt

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利用X射线粉末衍射和比热研究了赝三元替代系列CeNi 9 − xFexGe 4(0≤x≤1)中Kondo效应、RKKY相互作用和晶场分裂之间的相互作用.与CeNi 8 CuGe 4和CeNi 8 CoGe 4相反,CeNi 8 FeGe 4中没有长程磁序,因为它基本上保留了类似于其母系统CeNi 9 Ge 4的四重简并Kondo晶格基态。Kondo屏蔽以及两个较低能态(Γ7(1)和Γ7(2))之间的适度CF分裂随着Fe浓度的增加而同时增加,导致整个取代区的Kondo主导基态。引入一个新的参数α= TRln 4/TRln 2来分析竞争能量尺度之间的相互作用。
The interplay between Kondo effect, RKKY interaction and crystal field (CF) splitting in the pseudo-ternary substitution series CeNi9−xFexGe4(0≤x≤1) is investigated by means of X-ray powder diffractometry and specific heat studies. Contrary to CeNi8CuGe4and CeNi8CoGe4no long range magnetic order occurs in CeNi8FeGe4since it basically retains a four-fold degenerate Kondo lattice ground state similar to its parent system CeNi9Ge4. Kondo screening as well as a modest CF splitting between the two lower energy states (Γ7(1)and Γ7(2)) increase simultaneously with increasing Fe concentration resulting in a Kondo dominated ground state for the whole substitution region. A new parameter α=TRln4/TRln2is introduced to analyze the interplay between the competing energy scales.
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