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Strongly Correlated Amorphous Ce Alloys-Structures, Electronic States and Low Temperature properties

机译：高度相关的非晶态铈合金-结构，电子态和低温特性

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摘要

The structures, electronic states and low temperature properties have been observedfor amorphous Ce-Cu,Ce -Si and Ce-Ru alloys produced by sputtering. The X0ray diffraction analysesof these alloysindicate that the chemical short range stuctues ofthe amorphous Ce-Cu and Ce-Si alloys are ordered, resembling their crystalline counterparts, while that of the amorphous CE-Ru alloy is disordered, being different from its crystalline counterpart. X-ray photoemission spectra indicate that the amorphous Ce-cu alloy is trivalent, the amorphous Ce-Ru alloy shows hybridization between the 4f and conduction electrons(whose valence number is about 3.23) and the electronic state of the amorphors Ce-Si alloy is inter-mediate between those of the amorphous Ce-CU and Ce-Ru alloys. The electronic specific heat coefficiebt estimated from the specific heat above 10 Kis more than a hundred times latger thn those of simple metals and it rapidly increases below 5 K(a heavy fermion behavior). The electrical resistivity is large due to disorder scattering and its temperature dependence displays -log~T dependence at low temperatures(an incoherent or impurity Komdo effect). However, it shows roughly AT~2(A>O) dependence and positive magnetoresistance in the amorphous Ce-Ru alloy whose crystalling counterpart has a very high Komdo tein-perature(a coherent Kondo effect).These results demonstrate that the heavy fermion characteristics　are depressed but not deleted even in randomalloys.
机译：已经观察到通过溅射制备的非晶态Ce-Cu，Ce-Si和Ce-Ru合金的结构，电子态和低温性能。这些合金的X射线衍射分析表明，非晶态Ce-Cu和Ce-Si合金的化学短程结构是有序的，类似于它们的结晶对应物，而非晶态CE-Ru合金的化学短程结构是无序的，不同于其结晶对应物。 X射线光发射光谱表明，非晶态的Ce-cu合金是三价的，非晶态的Ce-Ru合金显示出4f和导电电子之间的杂化（化合价约为3.23），非晶态的Ce-Si合金的电子态为。介于非晶态Ce-CU和Ce-Ru合金之间。从10 Kis以上的比热估计的电子比热系数是简单金属的比热的一百倍，并且在5 K以下迅速增加（重费米子行为）。电阻率由于无序散射而变大，并且其温度依赖性在低温下显示出-log〜T依赖性（非相干或杂质Komdo效应）。但是，在非晶态的Ce-Ru合金中，AT〜2（A> O）的依赖性和正磁阻表现为非晶态的Ce-Ru合金具有很高的Komdo口性（相干的近藤效应）。沮丧，即使在随机合金中也不会删除。

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