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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/50817
Record Status
Checked
Record Id
50817
Title
Zener double exchange from local valence fluctuations in magnetite
Contributors
RJ McQueeney
,
M Yethiraj
,
S Chang
,
W Montfrooij
,
TG Perring (STFC Rutherford Appleton Lab.)
,
JM Honig
,
P Metcalf
Abstract
Magnetite (Fe3O4) is a mixed valent system where electronic conductivity occurs on the B site (octahedral) iron sublattice of the spinel structure. Below TV=123 K, a metal-insulator transition occurs which is argued to arise from the charge ordering of 2+ and 3+ iron valences on the B sites (Verwey transition). Inelastic neutron scattering measurements show that optical spin waves propagating on the B site sublattice (~80 meV) are shifted upwards in energy above TV due to the occurrence of B-B ferromagnetic double exchange in the mixed valent phase. The double exchange interaction affects only spin waves of 5 symmetry, not all modes, indicating that valence fluctuations are slow and the double exchange is constrained by short-range electron correlations above TV.
Organisation
ISIS
,
ISIS-MAPS
,
STFC
Keywords
Physics
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
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Year
Journal Article
Phys Rev Lett
99 (2007): 246401.
doi:10.1103/PhysRevLett.99.246401
PhysRevLett_99_246401.pdf
2007
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