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ARTICLE https://doi.org/10.1038/s41467-022-28207-w OPEN Antiferromagnetic excitonic insulator state in Sr3Ir2O7 D. G. Mazzone 1,2✉, Y. Shen1, H. Suwa 3,4, G. Fabbris 5, J. Yang4, S.-S. Zhang4, H. Miao 6, J. Sears1, Ke Jia7, Y. G. Shi7, M. H. Upton5, D. M. Casa5, X. Liu8✉, Jian Liu 4, C. D. Batista 4,9 & M. P. M. Dean 1✉ Excitonic insulators are usually considered to form via the condensation of a soft charge mode of bound electron-hole pairs. This, however, presumes that the soft exciton is of spin- singlet character. Early theoretical considerations have also predicted a very distinct scenario, in which the condensation of magnetic excitons results in an antiferromagnetic excitonic insulator state. Here we report resonant inelastic x-ray scattering (RIXS) measurements of Sr3Ir2O7. By isolating the longitudinal component of the spectra, we identify a magnetic mode that is well-defined at the magnetic and structural Brillouin zone centers, but which merges with the electronic continuum in between these high symmetry points and which decays upon heating concurrent with a decrease in the material’s resistivity. We show that a bilayer Hubbard model, in which electron-hole pairs are bound by exchange interactions, con- sistently explains all the electronic and magnetic properties of Sr3Ir2O7 indicating that this material is a realization of the long-predicted antiferromagnetic excitonic insulator phase. 1 Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, USA. 2 Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen, Switzerland. 3 Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan. 4 Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA. 5 Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA. 6 Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. 7 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. 8 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China. 9 Quantum Condensed Matter Division and Shull-Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. ✉email: daniel.mazzone@psi.ch; liuxr@shanghaitec.edu.cn; mdean@bnl.gov NATURE COMMUNICATIONS | (2022)13:913 | https://doi.org/10.1038/s41467-022-28207-w | www.nature.com/naturecommunications 1 1234567890():,;PDF Image | Antiferromagnetic excitonic insulator state in Sr3Ir2O7
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