DataVXAdvanced Materials InterfacesPaper
journal article·2017-07Open access

Energy Level Alignment and Cation Charge States at the LaFeO3/LaMnO3 (001) Heterointerface

Sergey Y. Smolin, Amber K. Choquette, Regan G. Wilks, Nicolas Gauquelin, Roberto Félix, Dominic Gerlach, Shigenori Ueda, Alex L. Krick, Johan Verbeeck, Marcus Bär, Jason B. Baxter, Steven J. May

Advanced Materials Interfaces· Volume 4· Issue 14
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Source abstract

Abstract

The electronic properties of LaFeO3/LaMnO3 epitaxial heterojunctions are investigated to determine the valence and conduction band offsets and the nominal Mn and Fe valence states at the interface. Studying a systematic series of (LaFeO3)n/(LaMnO3)m bilayers (m ≈ 50) epitaxially grown in the (001) orientation using molecular beam epitaxy, layer‐resolved electron energy loss spectroscopy reveals a lack of significant interfacial charge transfer, with a nominal 3+ valence state observed for both Mn and Fe across the interface. Through a combination of variable angle spectroscopic ellipsometry and hard X‐ray photoelectron spectroscopy, type I energy level alignments are obtained at the LaFeO3/LaMnO3 interface with positive valence and conduction band offsets of (1.20 ± 0.07) eV and (0.5–0.7 ± 0.3) eV, respectively, with minimal band bending. Variable temperature resistivity measurements reveal that the bilayers remain insulating and that the presence of the heterojunction does not result in a conducting interface.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Multiferroics and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemical and Biological Engineering Drexel University Philadelphia PA 19104 USA

Department of Materials Science and Engineering Drexel University Philadelphia PA 19104 USA

Renewable Energy Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Hahn‐Meitner‐Platz 1 D‐14109 Berlin Germany

Energy Materials In‐Situ Laboratory Berlin (EMIL) Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Albert‐Einstein‐Str. 15 D‐12489 Berlin Germany

EMAT‐ University of Antwerp Groenenborgerlaan 171 B‐2020 Antwerp Belgium

MANA/Nano‐Electronics Materials Unit National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan

Synchrotron X‐ray Station at SPring‐8 NIMS. 1‐1‐1 Kouto Sayo‐cho Hyogo 679‐5148 Japan

Quantum Beam Unit NIMS 1‐2‐1 Sengen Tsukuba Ibaraki 305‐0047 Japan

Institut für Physik und Chemie Brandenburgische Technische Universität Cottbus‐Senftenberg Platz der Deutschen Einheit 1 D‐03046 Cottbus Germany

Funding

National Science Foundation · Deutscher Akademischer Austauschdienst · Fonds Wetenschappelijk Onderzoek · U.S. Department of Energy

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