Structure and magnetic properties of hollandite Ba1.2Mn8O16

被引：48
作者：
Ishiwata, S [1 ]
Bos, JWG
Huang, Q
Cava, RJ
机构：
[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
[2] Waseda Univ, Dept Appl Phys, Tokyo 1698555, Japan
[3] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2006年 / 18卷 / 15期
关键词：
D O I：
10.1088/0953-8984/18/15/019
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The synthesis, crystal structure and magnetic properties of Ba1.2Mn8O16, obtained using a KCl mineralizer, are reported. This material crystallizes in the monoclinic hollandite structure, containing Mn-O double chains (space group: 12/m, a = 10.052(1) angstrom, b = 2.8579(2) angstrom, c = 9.7627(10) angstrom, beta = 89.96(1)degrees), and undergoes a magnetic transition at 40 K with the magnetization having a small ferromagnetic component. The ordering temperature is nearly 10 times lower than expected from the Weiss temperature of -385 K, evidencing magnetic frustration. Preliminary neutron powder diffraction studies suggest a complex spin arrangement within the ac-plane (perpendicular to the chain axis). The resistivity is consistent with one-dimensional variable range hopping.
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页码：3745 / 3752
页数：8
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