Electron doping of a double-perovskite flat-band system

Lun Jin, Nicodemos Varnava, Danrui Ni, Xin Gui, Xianghan Xu, Yuanfeng Xu, B. Andrei Bernevig, Robert J. Cava

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Electronic structure calculations indicate that the Sr2FeSbO6 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 Sr2-xLaxFeSbO6 (0 ≤ x ≤ 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.

Original languageEnglish (US)
Article numbere2218997120
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number8
StatePublished - Feb 21 2023

All Science Journal Classification (ASJC) codes

  • General


  • X-ray powder diffraction
  • cation-ordered double perovskites
  • electron-doping
  • flat-band materials
  • magnetism


Dive into the research topics of 'Electron doping of a double-perovskite flat-band system'. Together they form a unique fingerprint.

Cite this