Neutron diffraction study of spin and charge ordering in SrFeO3-delta
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Date
2012-05-22
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Publisher
American Physical Society
Abstract
We report a comprehensive neutron diffraction study of the crystal structure and magnetic order in a series of single-crystal and powder samples of SrFeO3-delta in the vacancy range 0 <= delta <= 0.23. The data provide detailed insights into the interplay between the oxygen vacancy order and the magnetic structure of this system. In particular, a crystallographic analysis of data on Sr8Fe8O23 revealed a structural transition between the high-temperature tetragonal and a low-temperature monoclinic phase with a critical temperature T = 75 K, which originates from charge ordering on the Fe sublattice and is associated with a metal-insulator transition. Our experiments also revealed a total of seven different magnetic structures of SrFeO3-delta in this range of delta, only two of which namely an incommensurate helix state in SrFeO3 and a commensurate, collinear antiferromagnetic state in Sr4Fe4O11) had been identified previously. We present a detailed refinement of some of the magnetic ordering patterns and discuss the relationship between the magnetotransport properties of SrFeO3-delta samples and their phase composition and magnetic microstructure. © 2012, American Physical Society.
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Keywords
Magnetism, Antiferromagnetism, Growth, Ambient temperature, Systems analysis, Crystal lattices
Citation
Reehuis, M., Ulrich, C., Maljuk, A., Niedermayer, C., Ouladdiaf, B., Hoser, A., Hofmann, T., & Keimer, B. (2012). Neutron diffraction study of spin and charge ordering in SrFeO3-delta. Physical Review B, 85(18), 184109. doi:10.1103/PhysRevB.85.184109