Absence of itinerant ferromagnetism in a cobalt-based oxypnictide

Abstract

We report a layered transition-metal-ordered oxypnictide Sr${}_2$CrCoAsO${}_3$. The new material was synthesized by solid-state reactions under vacuum. It has an intergrowth structure with a perovskite-like Sr${}_3$Cr${}_2$O${}_6$ unit and ThCr${}_2$Si${}_2$-type SrCo${}_2$As${}_2$ block stacking coherently along the crystallographic $c$ axis. The measurements of electrical resistivity, magnetic susceptibility, and specific heat indicate metallic conductivity from the CoAs layers and short-range antiferromagnetic ordering in the CrO${}_2$ planes. No itinerant-electron ferromagnetism expected in CoAs layers is observed. This result, combined with the first-principles calculations and the previous reports of other CoAs-layer-based materials, suggests that the Co$-$Co bondlength plays a crucial role in the emergence of itinerant ferromagnetism.

9 pages, 7 figures

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