Structure and magnetic properties of hollandite Ba1.2Mn8O16

S Ishiwata, J W G Bos, Q Huang, R J Cava

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Abstract

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.

Original languageEnglish
Pages (from-to)3745-3752
Number of pages8
JournalJournal of Physics: Condensed Matter
Volume18
Issue number15
DOIs
Publication statusPublished - 19 Apr 2006

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