小体积坍缩作为$Sm_{1-x}Eu_xS$中三体磁极化子的证据
Mini Volume Collapse as Evidence for a 3-Body Magnetic Polaron in $Sm_{1-x}Eu_xS$
摘要：
钐硫化物（SmS）是一种非磁性窄隙（0.06 eV）半导体，在6.5 kbar下会发生金属中间价态的跃迁。硫化铕（EuS）是一种铁磁半导体，居里温度为16 K，带隙为1.6 eV。在这里，我们提出了一个研究的晶格常数，磁化率和电阻率的替代系列$Sm_{1-x}Eu_xS$ 0 < x < 1。我们观察到一个平滑的插值的磁性和运输行为在整个系列，符合虚拟晶体的情况下和Vegard的法律。然而，令人惊讶的是，晶格常数偏离低于Vegard定律的方式，这表明参数控制的Sm-Sm的距离由Eu矩的方式的磁极化子。
英文摘要：
Samarium sulfide (SmS) is a non-magnetic narrow-gap (0.06 eV) semiconductor which undergoes a transition to a metallic intermediate valence state at 6.5 kbar. Europium sulfide (EuS) is a ferromagnetic semiconductor with a Curie temperature of 16K and a gap of 1.6 eV. Here we present a study of the lattice constant, magnetic susceptibility, and resistivity of the substitution series $Sm_{1-x}Eu_xS$ for 0 < x < 1. We observe a smooth interpolation of magnetic and transport behavior across the series, consistent with a virtual crystal scenario and Vegard's law. Surprisingly, however, the lattice constant deviates below Vegard's law in a manner that suggests parametric control of the Sm-Sm distance by the Eu moment in the manner of a magnetic polaron.
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