Hyperfine properties of La(V_1−xFe_x)O₃ compounds

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• 作者：L. F. S. Tupan ; F. F. Ivashita ; R. Barco ; B. Hallouche…
• 关键词：LaVO3 ; Anomalous diamagnetism ; Iron doped ; Rietveld refinement ; Mössbauer spectroscopy
• 刊名：Hyperfine Interactions
• 出版年：2017
• 出版时间：November 2017
• 年：2017
• 卷：238
• 期：1
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Nuclear Physics, Heavy Ions, Hadrons; Atomic, Molecular, Optical and Plasma Physics; Condensed Matter Physics; Surfaces and Interfaces, Thin Films;
• 出版者：Springer International Publishing
• ISSN：1572-9540
• 卷排序：238

文摘

LaV_1−xFe_xO₃ perovskites were synthesized in the vanadium-rich concentration range (i.e., x < 0.5) and characterized structurally and for the hyperfine properties of the iron nuclear probe. The aim of this investigation was to better understand the physical transformations that take place in the undoped compound (LaVO₃) at low temperatures. For that, X-ray diffraction analysis and, more extensively, 57Fe Mössbauer spectroscopy were applied. The results revealed that the LaV₁-xFexO₃ vanadium-rich perovskites are orthorhombic at RT, and their lattice parameters decrease with increasing vanadium concentration. Lowering the temperature, the system becomes magnetic, with the iron moment freezing progressively. The presence of two magnetic subspectral components obtained at the lowest measurement temperatures suggests that the vanadium-rich samples, including LaVO₃, undergo a phase transition from an orthorhombic to a monoclinic structure at low temperatures.