Journal article
Electronic transition above room temperature in CaMn{sub 7}O{sub 12} films
Applied physics letters, Vol.107(14)
05 Oct 2015
Abstract
We report on the electronic phase transition in CaMn{sub 7}O{sub 12} quadruple perovskite films synthesized by oxide molecular beam epitaxy on SrLaAlO{sub 4} and La{sub 0.3}Sr{sub 0.7}Al{sub 0.65}Ta{sub 0.35}O{sub 3} substrates. We use x-ray diffraction and transmission electron microscopy to confirm that the CaMn{sub 7}O{sub 12} phase has been realized. Temperature dependent resistivity measurements reveal a signature of a charge ordering phase transition at ≈425 K, consistent with bulk CaMn{sub 7}O{sub 12}. 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.
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Details
- Title
- Electronic transition above room temperature in CaMn{sub 7}O{sub 12} films
- Creators
- A. HuonA. C. LangE. J. MoonM. L. TaheriS. J. May - Drexel UniversityD. Saldana-GrecoJ. S. LimA. M. Rappe - University of Pennsylvania
- Publication Details
- Applied physics letters, Vol.107(14)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991021934208804721