Ordering in Two‐ and Three‐Dimensional Diluted Heisenberg Antiferromagnets
Ordering in Two‐ and Three‐Dimensional Diluted Heisenberg Antiferromagnets
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二维和三维稀释海森堡反铁磁体的排序
DOI：
10.1063/1.1658906
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发表时间：
1970
影响因子：
3.2
通讯作者：
A. Miedema
中科院分区：
文献类型：
--
作者：
D. J. Breed;K. Gilijamse;J. Sterkenburg;A. Miedema
给出了磁稀释反铁磁系统K2 MnpMg 1 − pF 4和KMnpMg 1 − pF 3的有序温度。从磁性的观点来看，这些系统可以被看作是简单的二次和简单的三次，分别。在p=1附近，（d/dp）[TN（p）/TN（1）]明显大于1，这是稀释海森堡系统的理论预期。TN作为浓度的函数的曲线表明，在T=0时，两个磁系统的有序化临界浓度明显不同;它们可能等于渗流问题的预测值。低场垂直磁化率强烈依赖于p，在较低温度下，它可以近似地由一种居里韦斯定律描述。将居里-韦斯行为外推到T=0，可以得到垂直磁化率的倒数值，如果将其绘制为磁性原子浓度的函数，则显示出与有序温度的浓度依赖性的明显相似性。
The ordering temperatures of the magnetically diluted antiferromagnetic systems K2MnpMg1−pF4 and KMnpMg1−pF3 are presented. From a magnetic point of view these systems can be looked upon as being simple quadratic and simple cubic, respectively. Near p=1, (d/dp)[TN(p)/TN(1)] is clearly larger than 1, as is theoretically expected for diluted Heisenberg systems. The curves for TN as a function of the concentration show that the critical concentrations for ordering at T=0 are clearly different for the two magnetic systems; they may be equal to the values predicted for the percolation problem. The low‐field perpendicular susceptibility strongly depends on p, at the lower temperatures it can be approximately described by a kind of Curie‐Weiss law. Extrapolating the Curie‐Weiss behavior down to T=0, one obtains values for the inverse perpendicular susceptibility that, if plotted as a function of the concentration of magnetic atoms, show a clear similarity to the concentration dependence of the ordering temperatu...