Kinetics of the charge ordering in magnetite below the Verwey temperature
Gooth J, Boehnert T, Gluschke JG, Hamdou B, Barth S, Goerlitz D, Zierold R, Nielsch K (2014)
Publication Type: Journal article
Publication year: 2014
Journal
Book Volume: 26
Article Number: 472202
Journal Issue: 47
DOI: 10.1088/0953-8984/26/47/472202
Abstract
In this work the kinetics of the charge ordering in magnetite (Fe3O4) below the Verwey transition temperature TV is investigated in time and energy domain. After excitation by a one-second voltage pulse to destruct the charge-ordered state below TV, an alternating current (AC) is used to perturb its recovery process. Upon warming up to above a temperature Tr(< TV) the charge order recovers despite the ac perturbation, because the temperature-dependent relaxation time becomes shorter than the polarity change of the ac. From the frequency dependence of Tr(f), an activation energy of ΔE = 126 meV is extracted. Below Tr the real part of the ac conductance Greal follows the relation Greal ∼ fα with α = 0.98 ± 0.18, suggesting that the charge reordering is driven by correlated hopping transport. The relaxation time τ = 1/f(Tr) of the charge-ordered state is determined for temperatures between 70 and 98 K and is extrapolated to τ(TV) = 1.6 ms, continuously slowing down its dynamics as the temperature is decreased.
Involved external institutions
Universität Hamburg (UHH)
Germany (DE)
University of New South Wales (UNSW)
Australia (AU)
Technische Universität Wien / Vienna University of Technology
Austria (AT)
Germany (DE)
University of New South Wales (UNSW)
Australia (AU)
Technische Universität Wien / Vienna University of Technology
Austria (AT)
How to cite
APA:
Gooth, J., Boehnert, T., Gluschke, J.G., Hamdou, B., Barth, S., Goerlitz, D.,... Nielsch, K. (2014). Kinetics of the charge ordering in magnetite below the Verwey temperature. Journal of Physics: Condensed Matter, 26(47). https://dx.doi.org/10.1088/0953-8984/26/47/472202
MLA:
Gooth, Johannes, et al. "Kinetics of the charge ordering in magnetite below the Verwey temperature." Journal of Physics: Condensed Matter 26.47 (2014).
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