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首页> 外文期刊>Physica, B. Condensed Matter >Thermodynamics of the 2D-Heisenberg classical square lattice Part III. Study of the static susceptibility behaviours
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Thermodynamics of the 2D-Heisenberg classical square lattice Part III. Study of the static susceptibility behaviours

机译：2D-海森堡经典方格子第三部分的热力学。静态磁化率行为的研究

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In a previous article labelled II a closed-form expression of the dynamic and static susceptibilities has been derived (J. Curely, Physics B 254 (1998) 277, previous article in this issue). In the present one, we mainly focus on the behaviours of the static susceptibility chi. In the low-temperature domain we point out the mechanisms involved in the construction of the 2D-spin arrangement; a very simple model allows one to give a good description of the chi T behaviours. For a 2D-compensated antiferromagnet, we derive a linear variation between the temperature of the maximum of the susceptibility curve T(chi(max)) and the exchange energy J/k(B). In addition, above the Neel temperature, there is a remarkable agreement between the experimental and theoretical susceptibilities, for the compounds BaMnF4 and (CH3NH3)(2)MnCl4. Finally, when T decreases from the high-temperature (HT) domain, we verify on these experimental results that the HT theoretical expansion of chi leads to a value lower than the one derived from Rushbrooke's HT series. In addition, it allows to fit all the experimental points belonging to the characteristic maximum of the susceptibility curve whereas the Padi method just permits to reach it before breaking down. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 31]
机译：在以前标记为II的文章中，已经得出了动态和静态磁化率的闭式表示形式（J. Curely，Physics B 254（1998）277，本期以前的文章）。在本篇文章中，我们主要关注静态磁化率chi的行为。在低温领域，我们指出了2D自旋装置构造中涉及的机制。一个非常简单的模型可以很好地描述chi T的行为。对于二维补偿的反铁磁体，我们得出磁化率曲线T（chi（max））的最大值的温度与交换能量J / k（B）之间的线性变化。此外，在Neel温度以上，对于化合物BaMnF4和（CH3NH3）（2）MnCl4，在实验和理论磁化率之间存在明显的一致性。最后，当T从高温（HT）域减小时，我们在这些实验结果上证明，chi的HT理论扩展导致其值低于从Rushbrooke HT系列得出的值。此外，它允许拟合属于磁化率曲线特征最大值的所有实验点，而Padi方法仅允许在分解之前达到它。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：31]

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