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Raman study of the Verwey transition in magnetite thin films

Baghaie Yazdi, M. and Choi, K.-Y. and Wulferding, D. and Lemmens, P. and Alff, L. (2013):
Raman study of the Verwey transition in magnetite thin films.
In: New Journal of Physics, IOP Publishing Deutsche Physikalische Gesellschaft, pp. 103032-(8 pp), 15, (10), ISSN 1367-2630, [Online-Edition: http://dx.doi.org/10.1088/1367-2630/15/10/103032],
[Article]

Abstract

We have grown epitaxial thin films of magnetite on MgO and Al2O3 substrates with sharp and distinct signatures of the Verwey transition in resistivity and magnetization. We have used Raman scattering to separate the footprint of purely structural changes from the effect of additional charge and orbital order. Raman modes related to the structural phase transition occur first at temperatures above the Verwey transition temperature. In contrast, newly emerging modes indicating additional charge and orbital order appear at the Verwey transition. These results suggest that the completion of the structural phase transition in magnetite is a necessary precursor triggering a transition into a complex charge and orbitally ordered state.

Item Type: Article
Erschienen: 2013
Creators: Baghaie Yazdi, M. and Choi, K.-Y. and Wulferding, D. and Lemmens, P. and Alff, L.
Title: Raman study of the Verwey transition in magnetite thin films
Language: English
Abstract:

We have grown epitaxial thin films of magnetite on MgO and Al2O3 substrates with sharp and distinct signatures of the Verwey transition in resistivity and magnetization. We have used Raman scattering to separate the footprint of purely structural changes from the effect of additional charge and orbital order. Raman modes related to the structural phase transition occur first at temperatures above the Verwey transition temperature. In contrast, newly emerging modes indicating additional charge and orbital order appear at the Verwey transition. These results suggest that the completion of the structural phase transition in magnetite is a necessary precursor triggering a transition into a complex charge and orbitally ordered state.

Journal or Publication Title: New Journal of Physics
Volume: 15
Number: 10
Publisher: IOP Publishing Deutsche Physikalische Gesellschaft
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 09 Jan 2014 09:36
Official URL: http://dx.doi.org/10.1088/1367-2630/15/10/103032
Identification Number: doi:10.1088/1367-2630/15/10/103032
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