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首页> 外文期刊>Physical review >Structure, magnetic ordering, and Kondo effect in (Ce_(1-x)Nd_x)_3Al
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Structure, magnetic ordering, and Kondo effect in (Ce_(1-x)Nd_x)_3Al

机译：（Ce_（1-x）Nd_x）_3Al中的结构，磁排序和近藤效应

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摘要

A systematic study for (Ce_(1-x)Nd_x)_3Al (x=0-1.0) compounds has been performed by measuring lattice parameters, electrical resistivity, magnetization, and specific heat. All samples exhibit the hexagonal crystal structure at room temperature. The lattice parameters and unit-cell volume decrease monotonically with increasing Nd content (x). An obvious hysteresis in temperature dependence of resistivity, which was attributed to the crystal structural phase transition, is found at x≤0.3. The low-temperature resistivity shows log T dependence, suggesting the Kondo effect at x≤0.3. The Neel temperature and structural transition temperature (T_S) decrease with increasing x, T_S merges with the antiferromagnetic (AFM) transition, and the Curie temperature increases linearly with increasing x at x≥0.2. Thus x～0.2 is a critical point where the ferromagnetic order and Kondo effect compete at low temperature. The effective magnetic moments μ_(eff) almost linearly decrease with increasing x and agree with the estimation assuming Nd~(3+) and Ce~(3+) states, indicating that the change in the electronic structures of Nd and Ce ions in the ground states is very small in the entire range. The characteristic temperature T_0 which was obtained by the fitting of Rajan's curve decreases with increasing x at x≤0.15, i.e., a small fraction of Nd content strongly dilute the Kondo effect as well as AFM order.
机译：通过测量晶格参数，电阻率，磁化强度和比热，对（Ce_（1-x）Nd_x）_3Al（x = 0-1.0）化合物进行了系统研究。所有样品在室温下均显示六方晶体结构。晶格参数和晶胞体积随Nd含量（x）的增加而单调降低。在x≤0.3处发现归因于晶体结构相变的电阻率的温度依赖性的明显滞后。低温电阻率显示出log T依赖性，表明在x≤0.3时的近藤效应。尼尔温度和结构转变温度（T_S）随着x的增加而降低，T_S与反铁磁（AFM）转变合并，并且居里温度在x≥0.2时随着x的增加线性增加。因此，x〜0.2是低温下铁磁有序和近藤效应竞争的临界点。有效磁矩μ_（eff）随x的增加几乎呈线性下降，并且与假定Nd〜（3+）和Ce〜（3+）状态的估计值一致，表明Nd和Ce离子在电子结构中的变化。在整个范围内，基态很小。在x≤0.15时，通过拉詹曲线的拟合获得的特征温度T_0随着x的增加而降低，即，一小部分的Nd含量强烈地削弱了近藤效应以及AFM阶数。

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