CeNi $_{1-x}$ Cu $_{x}$合金磁滞跳变的随机各向异性集团模型
A cluster model with random anisotropy for hysteresis jumps in CeNi$_{1-x}$Cu$_{x}$ alloys
摘要：
一些铈化合物在非常低的温度下表现出磁滞循环，在磁化强度中具有尖锐的宏观跳跃。这种效应归因于在其中各向异性与所施加的磁场竞争的簇的形成。在这里，我们提出了一个简单的模型，其中的晶格铁磁耦合自旋分离在集群的随机大小和随机各向异性。在这个模型中，我们得到的滞后周期呈现跳跃的行为，以类似的方式，实验的，并消失时，增加温度。结果是在很低的温度下在CeNi $_{1-x}$ Cu $_{x}$和这些实验结果的比较测量的滞后循环，可以区分的相对重要性的机制驱动的热演化的周期。
英文摘要：
Some Cerium compounds exhibit hysteresis cycles with sharp macroscopic jumps in the magnetization at very low temperatures. This effect is attributed to the formation of clusters in which the anisotropy competes with the applied magnetic field. Here, we present a simple model where a lattice of ferromagnetically coupled spins is separated in clusters of random sizes and with random anisotropy. Within this model, we obtain hysteresis cycles presenting jumps that behave in a similar way that the experimental ones, and that disappear when increasing the temperature. The results are in good agreement with the hysteresis cycles measured at very low temperatures in CeNi$_{1-x}$Cu$_{x}$ and the comparison with these experimental results allows to discriminate the relative importance of the mechanisms driving the thermal evolution of the cycles.
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