Abstract
Structural and magnetic properties are investigated for Fe1−x Mnx V2O4 (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, V3+ orbital order (V-OO) plays an important role on global structure. Here x = 0.6 is a critical point. Fe2+ F-OO and V3+ F-OO coexist for 0 ≤ x ≤ 0.5. For x ≥ 0.6, the orbital pattern of V3+ 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 V3+ orbitals is proposed.
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