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Article overview
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Zener double exchange from local valence fluctuations in magnetite | | R. J. McQueeney
; M. Yethiraj
; S. Chang
; W. Montfrooij
; T. G. Perring
; J. Honig
; P. Metcalf
; | | Date: |
16 Jul 2007 | | Abstract: | Magnetite (Fe$_{3}$O$_{4}$) is a mixed valent system where electronic
conductivity occurs on the B-site (octahedral) iron sublattice of the spinel
structure. Below $T_{V}=122$ 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 ($sim$80 meV) are
shifted upwards in energy above $T_{V}$ due to the occurrence of B-B
ferromagnetic double exchange in the mixed valent metallic phase. The double
exchange interaction affects only spin waves of $Delta_{5}$ symmetry, not all
modes, indicating that valence fluctuations are slow and the double exchange is
constrained by electron correlations above $T_{V}$. | | Source: | arXiv, arxiv.0707.2253 | | Services: | Forum | Review | PDF | Favorites | |
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