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Magnetic Structure of the Quasi-One-Dimensional La3OsO7 as Determined by Neutron Powder Diffraction

Insulating 5d3 La3OsO7 and hole doped La2.8Ca0.2OsO7 materials featuring well separated pseudo-one-dimensional zig-zag chains of corner-sharing OsO6 octahedra have been synthesized and their magnetic and electrical transport properties characterized. Long range magnetic order between the antiferromagnetic chains is determined with a propagation vector k = 1/2, 1/2, 0 and TN = 45 and 53 K for the parent and doped materials. An Os5+ moment of 1.7(1) μB for La3OsO7 and 1.2(2) μB for La2.8Ca0.2OsO7 is refined. The long range magnetic structure is compared to the few currently known for isostructural Ln3MO7 compounds.

preprint2015arXivOpen access

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