论文标题
新的搭扣蜂窝晶格化合物SR3CAOS2O9在室温上表现出抗铁磁性
New Buckled Honeycomb Lattice Compound Sr3CaOs2O9 Exhibiting Antiferromagnetism above Room Temperature
论文作者
论文摘要
据报道，新的2：1的合成，晶体结构和磁性三重钙钛矿SR3CAOS2O9。该化合物在P21/C空间组中结晶，并具有独特的Osmium搭扣蜂窝状晶格。它表现出远距离的抗铁磁秩序，高NEEL温度为385 K，易感性，热容量和中子衍射测量结果证实，并且是电绝缘的。该化合物也是2：1订购的Osmate Perovskite的第一个示例。理论研究表明，SR3CAOS2O9具有冰球平面之间相当大的抗磁性交换，导致高TN。相比之下，已知化合物SR3CARU2O9的磁性特性被阐明。它显示出低于TN = 200 K的抗铁磁顺序。
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.
