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.

arXiv comment9 pages, 7 figures

References in corpus (22)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Superconductivity in Co-doped LaFeAsO
• Transition of stoichiometricSr2VO3FeAs to a superconducting state at 37.2 K
• Effect of Co doping on superconductivity and transport properties in SmFe${}_{1-x}$Co${}_x$AsO
• Superconductivity induced by cobalt doping in iron-based oxyarsenides
• Itinerant Ferromagnetism in layered crystals LaCoOX (X = P, As)
• Renormalized behavior and proximity to a magnetic quantum critical point in BaCo${}_2$As${}_2$
• Narrow superconducting window in Ni-doped LaFeAsO
• New iron-based arsenide oxides (Fe2As2)(Sr4M2O6)(M = Sc, Cr)
• Crystallographic, Electronic, Thermal and Magnetic Properties of Single-Crystal SrCo2As2
• Crystal Growth and Physical Properties of SrCu2As2, SrCu2Sb2 and BaCu2Sb2
• Two successive field-induced spin-flop transitions in single-crystalline CaCo${}_2$As${}_2$
• Stripe Antiferromagnetic Spin Fluctuations in SrCo${}_2$As${}_2$
• Crystal Chemistry and Structural Design of Iron-Based Superconductors
• The layered iron arsenides Sr2CrO3FeAs and Ba2ScO3FeAs
• Coexistence of ferromagnetic and stripe antiferromagnetic spin fluctuations in SrCo${}_2$As${}_2$
• Crystallography and Physical Properties of BaCo2As2, Ba{0.94}K{0.06}Co2As2 and Ba{0.78}K{0.22}Co2As2
• Non-Fermi-liquid behaviors associated with a magnetic quantum-critical point in Sr(Co{1-x}Ni{x})2As2 single crystals
• Non-stoichiometry and the magnetic structure of Sr2CrO3FeAs
• Electronic structure and spin dynamics of ACo2As2 (A=Ba, Sr, Ca)