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Electron doping of a double-perovskite flat-band system. | LitMetric

AI Article Synopsis

  • The SrFeSbO double perovskite features a flat-band just above the Fermi level, influenced by weak electron hopping and lattice geometry.
  • To study this, electron-doped versions (SrLaFeSbO) were created, and their magnetism and crystal structures were analyzed using advanced X-ray techniques.
  • Although all samples show an antiferromagnetic peak in magnetic susceptibility, the nature of spin coupling changes from antiferromagnetic to ferromagnetic with increased electron doping, but the specific contributing subbands are yet to be identified.

Article Abstract

Electronic structure calculations indicate that the SrFeSbO double perovskite has a flat-band set just above the Fermi level that includes contributions from ordinary subbands with weak kinetic electron hopping plus a flat subband that can be attributed to the lattice geometry and orbital interference. To place the Fermi energy in that flat band, electron-doped samples with formulas SrLaFeSbO (0 ≤ ≤ 0.3) were synthesized, and their magnetism and ambient temperature crystal structures were determined by high-resolution synchrotron X-ray powder diffraction. All materials appear to display an antiferromagnetic-like maximum in the magnetic susceptibility, but the dominant spin coupling evolves from antiferromagnetic to ferromagnetic on electron doping. Which of the three subbands or combinations is responsible for the behavior has not been determined.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9974513PMC
http://dx.doi.org/10.1073/pnas.2218997120DOI Listing

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