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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/53917
Record Status
Checked
Record Id
53917
Title
Spin and orbital order in the vanadium spinel MgV2O4
Contributors
EM Wheeler (Pr.Au.)
,
B Lake
,
ATMN Islam
,
M Reehuis
,
P Steffen
,
T Guidi
,
AH Hill
Abstract
We present a study of the frustrated spinel MgV2O4, which possesses highly coupled spin, lattice, and orbital degrees of freedom. Using large single crystal and powder samples, we find a distortion from spinel at room temperature (space group F4̅ 3m) which allows for a greater trigonal distortion of the VO6 octahedra and a low-temperature space group (I4̅ m2) that maintains the mirror plane symmetry. The magnetic structure that develops below 42 K consists of antiferromagnetic chains with a strongly reduced moment while inelastic neutron scattering reveals one-dimensional behavior and a single band of excitations. The implications of these results are discussed in terms of various orbital-ordering scenarios. We conclude that although spin-orbit coupling must be significant to maintain the mirror plane symmetry, the trigonal distortion is large enough to mix the 3d levels leading to a wave function of mixed real and complex orbitals.
Organisation
ISIS
,
ISIS-MERLIN
,
STFC
Keywords
Physics
,
spinel
,
orbital order
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Phys Rev B
82 (2010): 140406(R).
doi:10.1103/PhysRevB.82.140406
2010
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