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Depth-Resolved Modulation of Metal-Oxygen Hybridization and Orbital Polarization across Correlated Oxide Interfaces. | LitMetric

AI Article Synopsis

  • Interface interactions in oxide heterostructures lead to significant changes in electronic, magnetic, and lattice properties.
  • A study using resonant X-ray reflectivity reveals that a superlattice of SrFeO and CaFeO shows a shift from O-like to Fe-like electronic characteristics across layers.
  • The findings offer insights into how electronic features, such as ligand hole density and orbital polarization, adapt at the interfaces, enhancing our understanding of band hybridization in correlated oxides.

Article 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 SrFeO and CaFeO is shown to exhibit an electronic character that spatially evolves from strongly O-like in SrFeO to strongly Fe-like in CaFeO . 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 SrFeO /CaFeO interfaces, the ligand hole density and orbital polarization reconstruct in a single unit cell of CaFeO , 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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Source
http://dx.doi.org/10.1002/adma.201902364DOI Listing

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