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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/51966
Record Status
Checked
Record Id
51966
Title
Magnetic excitations of the gapped quantum spin dimer antiferromagnet Sr3Cr2O8
Contributors
DL Quintero-Castro (Pr.Au.)
,
B Lake
,
EM Wheeler
,
ATMN Islam
,
T Guidi (STFC Rutherford Appleton Lab.)
,
KC Rule
,
Z Izaola
,
M Russina
,
K Kiefer
,
Y Skourski
Abstract
Sr3Cr2O8 consist of a lattice of spin-1/2 Cr5+ ions, which form hexagonal bilayers and which are paired into dimers by the dominant antiferromagnetic intrabilayer coupling. The dimers are coupled three dimensionally by frustrated interdimer interactions. A structural distortion from hexagonal to monoclinic leads to orbital order and lifts the frustration giving rise to spatially anisotropic exchange interactions. We have grown large single crystals of Sr3Cr2O8 and have performed DC susceptibility, high-field magnetization and inelastic neutron scattering measurements. The neutron scattering experiments reveal three gapped and dispersive singlet to triplet modes arising from the three twinned domains that form below the transition thus confirming the picture of orbital ordering. The exchange interactions are extracted by comparing the data to a random phase approximation model and the dimer coupling is found to be J_0=5.551(9) meV, while the ratio of interdimer to intradimer exchange constants is J'/J_0=0.64(2). The results are compared to those for other gapped magnets.
Organisation
ISIS
,
ISIS-MERLIN
,
STFC
Keywords
Physics
,
spin dimer
,
magnetic excitations
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Phys Rev B
81 (2010): 014415.
doi:10.1103/PhysRevB.81.014415
2010
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