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Sign up to receive regular email alerts from Physical Review B. This reinforces the conclusion that the spin canting transition is associated with the ordering of vanadium orbitals in this system, and closer analysis indicates closely related physics underlying orbital transitions in FeV 2 O 4 and MnV 2 O 4. Figure 1 a Heat capacity and magnetization data for the single-crystal sample from the current neutron scattering study. Taking into account the direction of ordered spins, we associate this anisotropy with the large trigonal distortion of VO 6 octahedra, previously observed via neutron powder diffraction measurements. Especially notable are the dispersive magnetic excitations which arise about points 2 0 0 and 4 0 0 and symmetric equivalents. Figure 2 a — d Contour plots of neutron scattering intensity in several energy-momentum transfer planes, showing the Q dependence of magnon excitations along several symmetric directions in reciprocal space. Lines are fits to the power-law temperature dependence, assuming one dashed or two solid order parameters. Figure 5 Temperature dependence of the excitation gap at the cubic 2 2 0 position in FeV 2 O 4. Abstract The spinel vanadates have become a model family for exploring orbital order on the frustrated pyrochlore lattice, and recent debate has focused on the symmetry of local crystal fields at the cation sites.

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