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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/50814
Record Status
Checked
Record Id
50814
Title
Itinerant magnetic excitations in antiferromagnetic CaFe2As2
Contributors
SO Diallo
,
VP Antropov
,
TG Perring (STFC Rutherford Appleton Lab.)
,
C Broholm
,
JJ Pulikkotil
,
N Ni
,
SL Bud'ko
,
PC Canfield
,
A Kreyssig
,
AI Goldman
,
RJ McQueeney
Abstract
Neutron scattering measurements of the magnetic excitations in single crystals of antiferromagnetic CaFe2As2 reveal steeply dispersive and well-defined spin waves up to an energy of ~100 meV. Magnetic excitations above 100 meV and up to the maximum energy of 200 meV are however broader in energy and momentum than the experimental resolution. While the low energy modes can be fit to a Heisenberg model, the total spectrum cannot be described as arising from excitations of a local moment system. Ab initio calculations of the dynamic magnetic susceptibility suggest that the high energy behavior is dominated by the damping of spin waves by particle-hole excitations.
Organisation
ISIS
,
ISIS-MAPS
,
STFC
Keywords
Physics
Funding Information
Related Research Object(s):
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Language
English (EN)
Type
Details
URI(s)
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Year
Journal Article
Phys Rev Lett
102 (2009): 187206.
doi:10.1103/PhysRevLett.102.187206
PhysRevLett_102_187206.pdf
2009
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