A Transition from Localized to Strongly Correlated Electron Behavior and Mixed Valence Driven by Physical or Chemical Pressure in ACo2As2 (A = Eu and Ca)

A Transition from Localized to Strongly Correlated Electron Behavior and Mixed Valence Driven by Physical or Chemical Pressure in ACo2As2 (A = Eu and Ca)

We demonstrate that the action of physical pressure, chemical compression, or aliovalent substitution in ACo2As2 (A = Eu and Ca) has a general consequence of causing these antiferromagnetic materials to become ferromagnets. In all cases, the mixed valence triggered at the electropositive A site resu...

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Veröffentlicht in:Journal of the American Chemical Society 2016-03, Vol.138 (8), p.2724-2731
Hauptverfasser: Tan, Xiaoyan, Fabbris, Gilberto, Haskel, Daniel, Yaroslavtsev, Alexander A, Cao, Huibo, Thompson, Corey M, Kovnir, Kirill, Menushenkov, Alexey P, Chernikov, Roman V, Garlea, V. Ovidiu, Shatruk, Michael
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Sprache:eng
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Zusammenfassung:We demonstrate that the action of physical pressure, chemical compression, or aliovalent substitution in ACo2As2 (A = Eu and Ca) has a general consequence of causing these antiferromagnetic materials to become ferromagnets. In all cases, the mixed valence triggered at the electropositive A site results in the increase of the Co 3d density of states at the Fermi level. Remarkably, the dramatic alteration of magnetic behavior results from the very minor (
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.5b12659