American Chemical Society, Journal of the American Chemical Society, 8(138), p. 2724-2731, 2016
DOI: 10.1021/jacs.5b12659
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We demonstrate that the action of physical pressure, chemical compression, or aliovalent substitution in ACo$_2$As$_2$ (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 (