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arXiv · 2203.05942

New Buckled Honeycomb Lattice Compound Sr3CaOs2O9 Exhibiting Antiferromagnetism above Room Temperature

Gohil S. Thakur·T. C. Hansen·Walter Schnelle·Shuping Guo·Oleg Janson·Jeroen van den Brink·Claudia Felser·Martin Jansen
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Abstract

Synthesis, crystal structure and magnetic properties of a new 2:1 ordered triple perovskite Sr3CaOs2O9 are reported. The compound crystallizes in P21/c space group and features a unique buckled honeycomb lattice of osmium. It exhibits long-range antiferromagnetic ordering with a high Neel temperature of 385 K as confirmed by susceptibility, heat capacity and neutron diffraction measurements and is electrically insulating. This compound is also the first example of a 2:1 ordered osmate perovskite. Theoretical investigations indicate that Sr3CaOs2O9 features a sizeable antiferromagnetic exchange between the puckered planes resulting in a high TN. The magnetic properties of the known compound Sr3CaRu2O9 are elucidated in comparison. It shows antiferromagnetic order below TN = 200 K.

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Gohil S. Thakur, T. C. Hansen, Walter Schnelle, Shuping Guo, Oleg Janson, Jeroen van den Brink, Claudia Felser, Martin Jansen. 2022-03-11. New Buckled Honeycomb Lattice Compound Sr3CaOs2O9 Exhibiting Antiferromagnetism above Room Temperature. https://doi.org/10.1021/acs.chemmater.2c00740

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