Structural and electronic properties of the ordered double perovskites A2MReO6 (A = Sr,Ca; M = Mg,Sc,Cr,Mn,Fe,Co,Ni,Zn)
Structural and electronic properties of the ordered double perovskites A2MReO6 (A = Sr,Ca; M = Mg,Sc,Cr,Mn,Fe,Co,Ni,Zn)
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DOI：
10.1103/physrevb.69.184412
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发表时间：
2004-05-01
影响因子：
3.7
通讯作者：
Tokura, Y
中科院分区：
文献类型：
--
作者：
Kato, H;Okuda, T;Tokura, Y
对一系列铼基有序双钙钛矿 A(2)MReO(6) (A=Sr,Ca; M=Mg,Sc,Cr,Mn,Fe,Co,Ni,Zn) 的结构和电子性质进行了研究，其中包含一些用于未来自旋电子用途的高温半金属的潜在候选者。中子衍射测量揭示了 Re-O 键长随其有效价态变化的变化，具体取决于反 M 离子，即基于 Re6+- 或 Re5+ 的绝缘态，或其他混合价金属（或几乎莫特绝缘）态。磁输运和比热研究阐明了M=Cr和Fe化合物随A位变化的金属-绝缘体现象以及半金属氧化物陶瓷的晶间隧道磁阻特性。
Structural and electronic properties have been investigated for a series of Re-based ordered double perovskites, A(2)MReO(6) (A=Sr,Ca; M=Mg,Sc,Cr,Mn,Fe,Co,Ni,Zn), which contain some prospective candidates of the high-temperature half-metals for future spin-electronic use. Neutron diffraction measurements have revealed the variation of the Re-O bond length with the change of its effective valence states depending on the counter M ion, namely, Re6+- or Re5+-based insulating states, or otherwise mixed-valent metallic (or barely Mott-insulating) states. Magnetotransport and specific heat studies have clarified metal-insulator phenomena for M=Cr and Fe compounds with the change of A site as well as the intergrain tunneling magnetoresistance characteristic of the ceramics of half-metal oxides.