Optical Properties and Magnetic Field-Induced Phase Transitions in the Ferroelectric State of Ni$_3$V$_2$O$_8$

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dc.creatorRai, R. C.
dc.creatorCao, J.
dc.creatorBrown, S.
dc.creatorMusfeldt, J. L.
dc.creatorKasinathan, D.
dc.creatorSingh, D. J.
dc.creatorLawes, G.
dc.creatorRogado, N.
dc.creatorCava, R. J.
dc.creatorWei, X.
dc.date2006-10-30
dc.date.accessioned2026-07-07T07:27:44Z
dc.date.available2026-07-07T07:27:44Z
dc.descriptionWe use a combination of optical spectra, first principles calculations, and energy dependent magneto-optical measurements to elucidate the electronic structure and to study the phase diagram of Ni$_3$V$_2$O$_8$. We find a remarkable interplay of magnetic field and optical properties that reveals additional high magnetic field phases and an unexpected electronic structure which we associate with the strong magneto-dielectric couplings in this material over a wide energy range. Specifically, we observed several prominent magneto-dielectric effects that derive from changes in crystal field environment around Ni spine and cross-tie centers. This effect is consistent with a field-induced modification of local structure. Symmetry-breaking effects are also evident with temperature. We find Ni$_3$V$_2$O$_8$ to be an intermediate gap, local moment band insulator. This electronic structure is particularly favorable for magneto-dielectric couplings, because the material is not subject to the spin charge separation characteristic of strongly correlated large gap Mott insulators, while at the same time remaining a magnetic insulator independent of the particular spin order and temperature.
dc.description12 figures, 11 pages, accepted in Physical Review B
dc.identifierhttps://arxiv.org/abs/cond-mat/0610835
dc.identifierhttp://arxiv.org/abs/cond-mat/0610835
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/117483
dc.subjectStrongly Correlated Electrons
dc.titleOptical Properties and Magnetic Field-Induced Phase Transitions in the Ferroelectric State of Ni$_3$V$_2$O$_8$
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