Magnetic phase diagram of Sr3Fe2O7-delta
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Date
2013-06-10
Journal Title
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Publisher
American Physical Society
Abstract
Magnetometry, electrical transport, and neutron scattering measurements were performed on single crystals of the Fe4+-containing perovskite-related phase Sr3Fe2O7−δ as a function of oxygen content. Although both the crystal structure and electron configuration of this compound are closely similar to those of well-studied ruthenates and manganates, it exhibits very different physical properties. The fully oxygenated compound (δ=0) exhibits a charge-disproportionation transition at TD=340 K, and an antiferromagnetic transition at TN=115 K. For temperatures T≤TD, the material is a small-gap insulator; the antiferromagnetic order is incommensurate, which implies competing exchange interactions between the Fe4+ moments. The fully deoxygenated compound (δ=1) is highly insulating, and its Fe3+ moments exhibit commensurate antiferromagnetic order below TN∼600 K. Compounds with intermediate δ exhibit different order with lower TN, likely as a consequence of frustrated exchange interactions between Fe3+ and Fe4+ sublattices. A previous proposal that the magnetic transition temperature reaches zero is not supported. © 2013, American Physical Society.
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Keywords
Monocrystals, Perovskite, Oxygen, Electronic structure, Manganates, Antiferromagnetic materials
Citation
Peets, D. C., Kim, J. H., Dosanjh, P., Reehuis, M., Maljuk, A., Aliouane, N., Ulrich, C., & Keimer, B. (2013). Magnetic phase diagram of Sr3Fe2O7-delta. Physical Review B, 87(21). doi:10.1103/PhysRevB.87.214410