论文标题
价对欧盟系统热电器的效应
Valence effect on the thermopower of Eu systems
论文作者
论文摘要
我们研究了EUNI2P2和EUIR2SI2的热电运输特性，以评估这些材料中临近相互作用和价波动的相关性。虽然传统的导电性表现，但热门曲线表现出较大的值，具有明显的最大值，如在基于CE和YB的重型铁材料中所观察到的。但是，这些最大值的位置和低温下的绝对热电器值都不符合重屈光度的情况和中等增强的有效荷载体质量。取而代之的是，我们可以考虑化学势的变化，将材料中的热电器与依赖温度依赖的欧盟价联系起来。我们的分析证实，价波动在EUNI2P2和EUIR2SI2中起重要作用。
We investigated the thermoelectric transport properties of EuNi2P2 and EuIr2Si2 in order to evaluate the relevance of Kondo interaction and valence fluctuations in these materials. While the thermal conductivities behave conventionally, the thermopower curves exhibit large values with pronounced maxima as typically observed in Ce- and Yb-based heavy-fermion materials. However, neither the positions of these maxima nor the absolute thermopower values at low temperature are in line with the heavy-fermion scenario and the moderately enhanced effective charge carrier masses. Instead, we may relate the thermopower in our materials to the temperature-dependent Eu valence by taking into account changes in the chemical potential. Our analysis confirms that valence fluctuations play an important role in EuNi2P2 and EuIr2Si2.
