CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Orbital Dilution Effect on Structural and Magnetic Properties of FeMnXV2O4 |
ZHAO Ke-Han, WANG Yu-Hang, SHI Xiao-Lan, LIU Na, ZHANG Liu-Wan** |
State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084
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Cite this article: |
ZHAO Ke-Han, WANG Yu-Hang, SHI Xiao-Lan et al 2015 Chin. Phys. Lett. 32 027501 |
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Abstract Structural and magnetic properties are investigated for Fe1?xMnxV2O4 (0≤x ≤1) spinels. As orbital-active Fe2+ is substituted with Mn2+, the cubic-to-tetragonal transition TS1 and the tetragonal-to-orthorhombic transition TS2 gradually decrease. These structural transitions originate from the Fe2+ ferro-orbital order (F-OO). Below Yafet–Kittel (YK) magnetic transition TN2, V 3+ orbital order (V-OO) plays an important role on global structure. Here x=0.6 is a critical point. Fe2+ F-OO and V 3+ F-OO coexist for 0≤x ≤0.5. For x≥0.6, the orbital pattern of V 3+ is antiferro (AF)-OO, and Fe2+ F-OO disappears. Structural transition TS3, accompanied by YK magnetic transition TN2, decreases initially, and then increases at x=0.6. A scenario for the complex phase diagram arising from the cooperation or competition of Fe2+ and V 3+ orbitals is proposed.
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Published: 20 January 2015
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PACS: |
75.25.Dk
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(Orbital, charge, and other orders, including coupling of these orders)
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75.47.Lx
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(Magnetic oxides)
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75.70.Tj
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(Spin-orbit effects)
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