Alkaline earth monosilicides (AESi, AE ) Ca, Sr, Ba) are poor metals, and their transport properties are not solely determined by the Zintl anion, in contrast to their Zintl-type composition. Their conducting network is formed by the depopulated ∞ 1 [Si 2-] π system and AE-d states. This justifies the special local coordination of the metal atoms and the planarity of the silicon chains. The low density of carriers seems to be a playground for magnetic instabilities and the triangular prismatic arrangement of AE atoms responsible for the observed weak glassy behavior.

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