Strong competition between orbital-ordering and itinerancy in a frustrated spinel vanadate

Abstract

The crossover from localized- to itinerant-electron behavior is associated with many intriguing phenomena in condensed-matter physics. In this paper, we investigate the crossover from localized to itinerant regimes in the spinel system Mn${}_{1-x}$Co${}_x$V${}_2$O${}_4$. At low Co doping, orbital order (OO) of the localized electrons on the V3+ ions suppresses magnetic frustration by triggering a tetragonal distortion. With Co doping, electronic itinerancy melts the OO and suppresses the structural phase transition while the reduced spin-lattice coupling produces magnetic frustration. Neutron scattering measurements and first-principles-guided spin models reveal that the non-collinear state at high Co doping is produced by weakened local anisotropy and enhanced Co-V spin interactions.

5 pages, 4 figures

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Cited by in corpus (10)

• An orbital glass state of a nearly metallic spinel, CoV${}_2$O${}_4$
• Structural transition and orbital glass physics in near itinerant CoV2O4
• Deviation from the dipole-ice model in the new spinel spin-ice candidate, MgEr${}_2$Se${}_4$
• Electronic States and Possible Origin of the Orbital-Glass State in a Nearly Metallic Spinel Cobalt Vanadate: An X-ray Magnetic Circular Dichroism Study
• Evolution of the magnetic and structural properties of Fe${}_{1-x}$Co${}_x$V${}_2$O${}_4$
• A variety of elastic anomalies in orbital-active nearly-itinerant cobalt vanadate spinel
• Spin Canting and Orbital Order in Spinel Vanadate Thin Films
• Large Magnetic Anisotropy and Magnetostriction in Thin Films of CoV${}_2$O${}_4$
• Orbital order and electron itinerancy in CoV${}_2$O${}_4$ and Mn${}_{0.5}$Co${}_{0.5}$V${}_2$O${}_4$ from first principles
• Insulator-metal transition and quasi-flat-band of Shastry-Sutherland lattice