Antiferromagnetic Order Breaks Inversion Symmetry in a Metallic Double Perovskite, Pb 2 NiOsO 6
Antiferromagnetic Order Breaks Inversion Symmetry in a Metallic Double Perovskite, Pb 2 NiOsO 6
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反铁磁有序打破金属双钙钛矿 Pb 2 NiOsO 6 中的反演对称性
DOI：
10.1021/acs.chemmater.1c01032
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发表时间：
2021
影响因子：
8.6
通讯作者：
Yamaura, Kazunari
中科院分区：
文献类型：
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作者：
Feng, Hai L.;Kang, Chang-Jong;Manuel, Pascal;Orlandi, Fabio;Su, Yu;Chen, Jie;Tsujimoto, Yoshihiro;Hadermann, Joke;Kotliar, Gabriel;Yamaura, Kazunari
在高压(6 Gpa)和高温(1575K)条件下合成了Pb2NiOsO6多晶样品。室温下，Pb2NiOsO6晶体为单斜双钙钛矿结构，空间群为P21/NaN。Pb2NiOsO6在2K以下是金属的，表现出单一的反铁磁(AFM)相变，Attn=58K。Pb2NiOsO6是具有三维连接性的金属和AFM氧化物的新例子。中子粉末衍射和第一性原理计算研究表明，Ni和Os磁矩均在T_n以下有序，原子力显微镜磁序破坏了反转对称性。这种由AFM有序驱动的反转对称性的丧失在金属系统中是不常见的，3D-5D双钙钛矿氧化物代表了一类新的非中心对称AFM金属氧化物。
A polycrystalline sample of Pb2NiOsO6was synthesized under high-pressure (6 GPa) and high-temperature (1575 K) conditions. Pb2NiOsO6crystallizes in a monoclinic double perovskite structure with a centrosymmetric space groupP21/nat room temperature. Pb2NiOsO6is metallic down to 2 K and shows a single antiferromagnetic (AFM) transition atTN= 58 K. Pb2NiOsO6is a new example of a metallic and AFM oxide with three-dimensional connectivity. Neutron powder diffraction and first-principles calculation studies indicate that both Ni and Os moments are ordered belowTNand the AFM magnetic order breaks inversion symmetry. This loss of inversion symmetry driven by AFM order is unusual in metallic systems, and the 3d–5d double-perovskite oxides represent a new class of noncentrosymmetric AFM metallic oxides.