Probing single-unit-cell resolved electronic structure modulations in oxide superlattices with standing-wave photoemission
| Autor: | Alexander X. Gray, Ravini U. Chandrasena, Steven J. May, R. dos Reis, Eun Ju Moon, James M. Rondinelli, Vladimir N. Strocov, Mingqiang Gu, Marius-Adrian Husanu, Jim Ciston, Weibing Yang, Arian Arab, Eric M. Gullikson, Slavomír Nemšák |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Photoemission spectroscopy Fluids & Plasmas Superlattice Oxide FOS: Physical sciences Bioengineering 02 engineering and technology Electronic structure 01 natural sciences Standing wave Condensed Matter::Materials Science chemistry.chemical_compound Engineering Atomic resolution 0103 physical sciences Scanning transmission electron microscopy 010306 general physics Condensed Matter - Materials Science Condensed matter physics Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Manganite cond-mat.mtrl-sci chemistry Physical Sciences Chemical Sciences 0210 nano-technology |
| Zdroj: | Physical Review B, vol 100, iss 12 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.100.125119 |
| Popis: | Author(s): Yang, W; Chandrasena, RU; Gu, M; Dos Reis, RMS; Moon, EJ; Arab, A; Husanu, MA; Nemsak, S; Gullikson, EM; Ciston, J; Strocov, VN; Rondinelli, JM; May, SJ; Gray, AX | Abstract: Control of structural coupling at complex-oxide interfaces is a powerful platform for creating ultrathin layers with electronic and magnetic properties unattainable in the bulk. However, with the capability to design and control the electronic structure of such buried layers and interfaces at a unit-cell level, a new challenge emerges to be able to probe these engineered emergent phenomena with depth-dependent atomic resolution as well as element- and orbital selectivity. Here, we utilize a combination of core-level and valence-band soft x-ray standing-wave photoemission spectroscopy, in conjunction with scanning transmission electron microscopy, to probe the depth-dependent and single-unit-cell resolved electronic structure of an isovalent manganite superlattice [Eu0.7Sr0.3MnO3/La0.7Sr0.3MnO3]×15 wherein the electronic-structural properties are intentionally modulated with depth via engineered oxygen octahedra rotations/tilts and A-site displacements. Our unit-cell resolved measurements reveal significant transformations in the local chemical and electronic valence-band states, which are consistent with the layer-resolved first-principles theoretical calculations, thus opening the door for future depth-resolved studies of a wide variety of heteroengineered material systems. |
| Databáze: | OpenAIRE |
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