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Structure and magnetism in the bond-frustrated spinel ZnCr2Se4

Zajdel, P., Li, W.-Y., van Beek, W., Lappas, A., Ziolkowska, A., Jaskiewicz, S., Stock, C., Green, M.A. (2017) Structure and magnetism in the bond-frustrated spinel ZnCr2Se4. Physical Review B, 95 (13). ISSN 2469-9950. (doi:10.1103/PhysRevB.95.134401) (KAR id:61902)

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The crystal and magnetic structures of stoichiometric ZnCr2Se4 have been investigated using synchrotron x-ray and neutron powder diffraction, muon spin relaxation (?SR), and inelastic neutron scattering. Synchrotron x-ray diffraction shows a spin-lattice distortion from the cubic Fd¯3m spinel to a tetragonal I41/amd lattice below TN = 21 K, where powder neutron diffraction confirms the formation of a helical magnetic structure with magnetic moment of 3.04(3)?B at 1.5 K, close to that expected for high-spin Cr3+. ?SR measurements show prominent local spin correlations that are established at temperatures considerably higher (<100 K) than the onset of long-range magnetic order. The stretched exponential nature of the relaxation in the local spin-correlation regime suggests a wide distribution of depolarizing fields. Below TN, unusually fast (>100?s?1) muon relaxation rates are suggestive of rapid site hopping of the muons in static field. Inelastic neutron scattering measurements show a gapless mode at an incommensurate propagation vector of k = [000.4648(2)] in the low-temperature

magnetic ordered phase that extends to 0.8 meV. The dispersion is modeled by a two-parameter Hamiltonian, containing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions with a Jnnn/Jnn = ?0.337.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.95.134401
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Mark Green
Date Deposited: 31 May 2017 14:06 UTC
Last Modified: 06 May 2020 03:16 UTC
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