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arXiv · 1905.04547

Mini Volume Collapse as Evidence for a 3-Body Magnetic Polaron in $Sm_{1-x}Eu_xS$

Daniel Schaller·Patrick G. LaBarre·Tiglet Besara·Ernst Bucher·Theo Siegrist·Arthur P. Ramirez
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Abstract

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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Daniel Schaller, Patrick G. LaBarre, Tiglet Besara, Ernst Bucher, Theo Siegrist, Arthur P. Ramirez. 2019-05-11. Mini Volume Collapse as Evidence for a 3-Body Magnetic Polaron in $Sm_{1-x}Eu_xS$. https://doi.org/10.1103/physrevmaterials.3.104602

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