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journal article·2019-10Open access

Depth‐Resolved Modulation of Metal–Oxygen Hybridization and Orbital Polarization across Correlated Oxide Interfaces

Paul C. Rogge, Padraic Shafer, Gilberto Fabbris, Wen Hu, Elke Arenholz, Evguenia Karapetrova, Mark P. M. Dean, Robert J. Green, Steven J. May

Advanced Materials· Volume 31· Issue 43
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Source abstract

Abstract

Abstract Interface‐induced modifications of the electronic, magnetic, and lattice degrees of freedom drive an array of novel physical properties in oxide heterostructures. Here, large changes in metal–oxygen band hybridization, as measured in the oxygen ligand hole density, are induced as a result of interfacing two isovalent correlated oxides. Using resonant X‐ray reflectivity, a superlattice of SrFeO3 and CaFeO3 is shown to exhibit an electronic character that spatially evolves from strongly O‐like in SrFeO3 to strongly Fe‐like in CaFeO3. This alternating degree of Fe electronic character is correlated with a modulation of an Fe 3d orbital polarization, giving rise to an orbital superstructure. At the SrFeO3/CaFeO3 interfaces, the ligand hole density and orbital polarization reconstruct in a single unit cell of CaFeO3, demonstrating how the mismatch in these electronic parameters is accommodated at the interface. These results provide new insight into how the orbital character of electrons is altered by correlated oxide interfaces and lays out a broadly applicable approach for depth‐resolving band hybridization.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics

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

Affiliations

Department of Materials Science and Engineering Drexel University 3141 Chestnut St. Philadelphia PA 19104 USA

Advanced Light Source Lawrence Berkeley National Laboratory 1 Cyclotron Rd. Berkeley CA 94720 USA

Department of Condensed Matter Physics and Materials Science Brookhaven National Laboratory 98 Rochester St. Upton NY 11973 USA

National Synchrotron Light Source II Brookhaven National Laboratory 98 Rochester St. Upton NY 11973 USA

Cornell High Energy Synchrotron Source Cornell University 161 Wilson Laboratory, Synchrotron Drive Ithaca NY 14853 USA

Advanced Photon Source Argonne National Laboratory 9700 S Cass Ave Lemont IL 60439 USA

Department of Physics and Engineering Physics University of Saskatchewan 116 Science Pl Saskatoon Saskatchewan S7N 5E2 Canada

Stewart Blusson Quantum Matter Institute University of British Columbia 111‐2355 E Mall Vancouver British Columbia V6T 1Z4 Canada

Funding

Army Research Office · Natural Sciences and Engineering Research Council of Canada · U.S. Department of Energy · Brookhaven National Laboratory · Basic Energy Sciences

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