Terahertz Conductivity at the Verwey Transition in Magnetite

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dc.creatorPimenov, A.
dc.creatorTachos, S.
dc.creatorRudolf, T.
dc.creatorLoidl, A.
dc.creatorSchrupp, D.
dc.creatorSing, M.
dc.creatorClaessen, R.
dc.creatorBrabers, V. A. M.
dc.date2005-03-24
dc.date.accessioned2026-07-07T03:04:17Z
dc.date.available2026-07-07T03:04:17Z
dc.descriptionThe complex conductivity at the (Verwey) metal-insulator transition in Fe_3O_4 has been investigated at THz and infrared frequencies. In the insulating state, both the dynamic conductivity and the dielectric constant reveal a power-law frequency dependence, the characteristic feature of hopping conduction of localized charge carriers. The hopping process is limited to low frequencies only, and a cutoff frequency nu_1 ~ 8 meV must be introduced for a self-consistent description. On heating through the Verwey transition the low-frequency dielectric constant abruptly decreases and becomes negative. Together with the conductivity spectra this indicates a formation of a narrow Drude-peak with a characteristic scattering rate of about 5 meV containing only a small fraction of the available charge carriers. The spectra can be explained assuming the transformation of the spectral weight from the hopping process to the free-carrier conductivity. These results support an interpretation of Verwey transition in magnetite as an insulator-semiconductor transition with structure-induced changes in activation energy.
dc.description6 Pages, 3 Figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0503606
dc.identifierhttp://arxiv.org/abs/cond-mat/0503606
dc.identifierPhys. Rev. B 72, 035131 (2005)
dc.identifierdoi:10.1103/PhysRevB.72.035131
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26081
dc.subjectStrongly Correlated Electrons
dc.titleTerahertz Conductivity at the Verwey Transition in Magnetite
dc.typetext

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