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Electronic transition above room temperature in CaMn7O12 films
Journal article   Open access   Peer reviewed

Electronic transition above room temperature in CaMn7O12 films

A. Huon, A. C. Lang, D. Saldana-Greco, J. S. Lim, E. J. Moon, A. M. Rappe, M. L. Taheri, S. J. May and Univ. of Pennsylvania, Philadelphia, PA (United States)
Applied physics letters, v 107(14), p142901
05 Oct 2015
url
https://www.osti.gov/biblio/1469380View

Abstract

Physical Sciences Physics Physics, Applied Science & Technology
We report on the electronic phase transition in CaMn7O12 quadruple perovskite films synthesized by oxide molecular beam epitaxy on SrLaAlO4 and La0.3Sr0.7Al0.65Ta0.35O3 substrates. We use x-ray diffraction and transmission electron microscopy to confirm that the CaMn7O12 phase has been realized. Temperature dependent resistivity measurements reveal a signature of a charge ordering phase transition at approximate to 425 K, consistent with bulk CaMn7O12. The transition temperature is found to be relatively invariant to changes in the cation stoichiometry. Density functional theory calculations reveal the changes in atomic and electronic structure induced by the charge ordering transition. (C) 2015 AIP Publishing LLC.

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Collaboration types
Domestic collaboration
Web of Science research areas
Physics, Applied
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