Abstract This study is the first attempt to apply the two-level Weiss model for the invar alloy to intermediate-valence samarium systems. This model is instrumental in giving a quantitative characterisation of the anomalous magnetic contribution to the coefficient of thermal expansion (CTE) of Sm0.80B6 and Sm1−xLaxB6 (x = 0, 0.10, 0.22, 0.50). A good agreement between the experimental and calculated magnetic contributions to the CTE is achieved for Sm0.78La0.22B6 over the temperature range from 0 K to 210 K. In other systems, a good fit is obtained over shorter temperature ranges. The model parameters and the dependence of the CTE minimum on the level of lanthanum doping in SmB6 are presented.

中文翻译：

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对 Sm 0.80 B 6 和伪二元化合物 Sm 1−x La x B 6 (x = 0, 0.10, 0.22, 0.50) 中热膨胀的异常负磁贡献分析

摘要 本研究首次尝试将殷钢合金的二能级 Weiss 模型应用于中价钐体系。该模型有助于定量表征异常磁性对 Sm0.80B6 和 Sm1−xLaxB6 (x = 0, 0.10, 0.22, 0.50) 的热膨胀系数 (CTE) 的贡献。在 0 K 到 210 K 的温度范围内，Sm0.78La0.22B6 对 CTE 的实验和计算的磁贡献之间实现了良好的一致性。在其他系统中，在较短的温度范围内获得了良好的拟合。介绍了模型参数和 CTE 最小值对 SmB6 中镧掺杂水平的依赖性。