Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals

Abstract

We study double-exchange models with itinerant t2g electrons in spinel and pyrochlore crystals. In both cases the localized spins form a network of corner-sharing tetrahedra. We show that the strong directional dependence of t2g orbitals leads to unusual Fermi surfaces that induce spin superstructures and noncoplanar orderings for a weak coupling between itinerant electrons and localized spins. Implications of our results to ZnV2O4 and Cd2Os2O7 are also discussed.

4 pages, 3 figures

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• Magnetic Field Induced Transition in Vanadium Spinels
• Multiferroic behavior in trimerized Mott insulators
• Dimensional crossover and the magnetic transition in electron doped manganites
• Orbital disorder induced by charge fluctuations in vanadium spinels
• Principal Chiral Model in Correlated Electron Systems
• Locally tunable disorder and entanglement in the one-dimensional plaquette orbital model
• Phase Diagram of the Shastry-Sutherland Kondo Lattice Model with Classical Localized Spins: A Variational Calculation Study
• Pyrochlore Oxide Hg2Os2O7 on Verge of Metal-Insulator Boundary
• Frustrated Kondo chains and glassy magnetic phases on the pyrochlore lattice
• Topological Hall effect in the Shastry-Sutherland lattice
• Electron quasi-itinerancy intertwined with quantum order by disorder in pyrochlore iridate magnetism
• Quantum Monte-Carlo study of magnetic ordering in ZnV2O4