Journal article
Inverted orbital polarization in strained correlated oxide films
Physical review. B, v 98(20), p201115(R)
28 Nov 2018
Abstract
Manipulating the orbital occupation of valence electrons via epitaxial strain in an effort to induce new functional properties requires considerations of how changes in the local bonding environment affect the band structure at the Fermi level. Using synchrotron radiation to measure the x-ray linear dichroism of epitaxially strained films of the correlated oxide CaFeO3, we demonstrate that the orbital polarization of the Fe valence electrons is opposite from conventional understanding. Although the energetic ordering of the Fe 3d orbitals is confirmed by multiplet ligand field theory analysis to be consistent with previously reported strain-induced behavior, we find that the nominally higher energy orbital is more populated than the lower. We ascribe this inverted orbital polarization to an anisotropic bandwidth response to strain in a compound with nearly filled bands. These findings provide an important counterexample to the traditional understanding of strain-induced orbital polarization and reveal a method to engineer otherwise unachievable orbital occupations in correlated oxides.
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Details
- Title
- Inverted orbital polarization in strained correlated oxide films
- Creators
- Paul C. Rogge - Drexel UniversityRobert J. Green - University of SaskatchewanPadraic Shafer - Lawrence Berkeley National LaboratoryGilberto Fabbris - Brookhaven National LaboratoryAndi M. Barbour - Brookhaven National LaboratoryBenjamin M. Lefler - Drexel UniversityElke Arenholz - Lawrence Berkeley National LaboratoryMark P. M. Dean - Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USASteven J. May - Drexel UniversityBrookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Details
- Physical review. B, v 98(20), p201115(R)
- Publisher
- Amer Physical Soc
- Number of pages
- 6
- Grant note
- W911NF-15-1-0133 / Army Research Office W911NF-14-1-0493 / Army Research Office DURIP grant DE-AC02-05CH11231 / DOE Office of Science User Facility; United States Department of Energy (DOE) DE-SC0012704 / DOE Office of Science; United States Department of Energy (DOE) DE-SC0012704 / U.S. Department of Energy (DOE), Office of Basic Energy Sciences; United States Department of Energy (DOE) 1047478 / Early Career Award Program Natural Sciences and Engineering Research Council of Canada; Natural Sciences and Engineering Research Council of Canada (NSERC); CGIAR
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000451609700002
- Scopus ID
- 2-s2.0-85057425828
- Other Identifier
- 991019167606604721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter