We report a layered transition-metal-ordered oxypnictide Sr2CrCoAsO3. The new material was synthesized by solid-state reactions under vacuum. It has an intergrowth structure with a perovskite-like Sr3Cr2O6 unit and ThCr2Si2-type SrCo2As2 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 CrO2 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.
@article{arxiv.2409.06337,
title = {Absence of itinerant ferromagnetism in a cobalt-based oxypnictide},
author = {Hua-Xun Li and Hao Jiang and Yi-Qiang Lin and Jia-Xin Li and Shi-Jie Song and Qin-Qing Zhu and Zhi Ren and Guang-Han Cao},
journal= {arXiv preprint arXiv:2409.06337},
year = {2024}
}