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

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

doi:10.1002/adma.201902364

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

Journal Article · Thu Sep 12 00:00:00 EDT 2019 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201902364· OSTI ID:1570671

Rogge, Paul C. ^[1]; Shafer, Padraic ^[2]; Fabbris, Gilberto ^[3]; Hu, Wen ^[4]; Arenholz, Elke ^[2]; Karapetrova, Evguenia ^[5]; Dean, Mark P. M. ^[3]; Green, Robert J. ^[6]; ^[1]

Drexel Univ., Philadelphia, PA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Univ. of British Columbia, Vancouver, BC (Canada); Univ. of Saskatchewan, Saskatoon, SK (Canada)

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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; SC0012704

OSTI ID:: 1570671

Alternate ID(s):: OSTI ID: 1756864
OSTI ID: 1561563

Report Number(s):: BNL--212192-2019-JAAM

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 43 Vol. 31; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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

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