General behavior of chalcogenides of rare-earth metals in transition to the intermediate valence state under high pressures
General behavior of chalcogenides of rare-earth metals in transition to the intermediate valence state under high pressures
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高压下稀土金属硫属化物向中间价态转变的一般行为
DOI：
10.1103/physrevb.90.165141
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发表时间：
2014
影响因子：
3.7
通讯作者：
V. Brazhkin
中科院分区：
文献类型：
--
作者：
O. Tsiok;L. G. Khvostantsev;A. V. Golubkov;I. Smirnov;V. Brazhkin
高精度测量的电阻，热电，TmS，TmSe和TmTe的静水压力高达8.5 GPa下的体积进行。TmTe和SmTe在电子跃迁区的电子输运特性和体积的行为的比较表明了一个完全的相似性的定量重合。我们发现，所有钐和铥硫族化合物在晶格塌缩区和随后的电子谱重建过程中的热电势服从普适依赖关系，对应于费米能级与电子态密度峰值的交点。所得结果证实了稀土金属硫族化合物中间价态的激子性质。
High-precision measurements of the electric resistance, thermopower, and volume of TmS, TmSe, and TmTe under hydrostatic pressures up to 8.5 GPa were conducted. Comparison of the behavior of the electron-transport characteristics and volume of TmTe and SmTe in the electron transition region demonstrates a complete analogy up to the quantitative coincidence. We found that the thermopower of all samarium and thulium chalcogenides in the lattice-collapse region and during the subsequent reconstruction of the electronic spectrum obeys the universal dependence, which corresponds to the intersection of the Fermi level with the peak of the electron density of states. The results obtained testify in favor of the exciton nature of the intermediate valence state in chalcogenides of the rare-earth metals.