@article{51e257060af04f51bf8150c06692b65f,
title = "Electron doping of a double-perovskite flat-band system",
abstract = "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.",
keywords = "cation-ordered double perovskites, electron-doping, flat-band materials, magnetism, X-ray powder diffraction",
author = "Lun Jin and Nicodemos Varnava and Danrui Ni and Xin Gui and Xianghan Xu and Yuanfeng Xu and Bernevig, {B. Andrei} and Cava, {Robert Joseph}",
note = "Funding Information: ACKNOWLEDGMENTS. The experimental research was primarily done at Princeton University, supported by the US Department of Energy Division of Basic Energy Sciences, through the Institute for Quantum Matter, Grant No. DE-SC0019331. The theory work was supported by the European Research Council (ERC) under the European Union{\textquoteright}s Horizon 2020 research and innovation programme (grant agreement No. 101020833), the ONR Grant No. N00014-20-1-2303, Simons Investigator Grant No. 404513, the Gordon and Betty Moore Foundation through the EPiQS Initiative, Grant GBMF11070 and Grant No. GBMF8685, NSF-MRSEC Grant No. DMR-2011750, BSF Israel US foundation Grant No. 2018226, and the Princeton Global Network Funds. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Publisher Copyright: {\textcopyright} 2023 National Academy of Sciences. All rights reserved.",
year = "2023",
month = feb,
day = "21",
doi = "10.1073/pnas.2218997120",
language = "English (US)",
volume = "120",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
publisher = "National Academy of Sciences",
number = "8",
}