VOLUME DEPENDENCE OF THE 1ST-ORDER TRANSITION-TEMPERATURE FOR RCO2 COMPOUNDS
VOLUME DEPENDENCE OF THE 1ST-ORDER TRANSITION-TEMPERATURE FOR RCO2 COMPOUNDS
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DOI：
10.1088/0305-4608/12/8/021
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发表时间：
1982-01-01
期刊：
影响因子：
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通讯作者：
SHIMIZU, M
中科院分区：
文献类型：
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作者：
INOUE, J;SHIMIZU, M
在巡游d电子和局域自旋共存的所谓SD模型中，磁自由能按总磁化强度M的幂函数展开。DyCo2、HoCo2和ErCo2的一级相变是从TC处的M4项系数的负值解释的，其中顺磁极化率在自由能展开时发散。利用自由能展开到M6项，研究了一阶转变温度TC‘的体积依赖关系。结果表明，该模型可以较好地解释DyCo2、HoCo2和ErCo2的dln TC‘/dlnV实验值。
The magnetic free energy in the so-called sd model where the itinerant d electrons and localised spins coexist is expanded in a power series of the total magnetisation M. The first-order transition observed for DyCo 2, HoCo 2 and ErCo 2 is explained from the negative values of the coefficient of the M 4 term at T C where the paramagnetic susceptibility diverges in the expansion of the free energy. Volume dependence of the first-order transition temperature T C'is studied by using the expansion of the free energy up to the M 6 term. It is shown that large experimental values of d ln T C'/d ln V for DyCo 2, HoCo 2 and ErCo 2 can be explained by this model.