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Mazzone, D. G. ; Shen, Y. ; Suwa, H. ; Fabbris, G. ; Yang, J. ; Zhang, S. -S. ; Miao, H. ; Sears, J. ; Jia, Ke ; Shi, Y. G. ; et al ( , Nature Communications)
Abstract 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, consistently explains all the electronic and magnetic properties of Sr3Ir2O7indicating that this material is a realization of the long-predicted antiferromagnetic excitonic insulator phase.
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Mazzone, D. G. ; Dzero, M. ; Abeykoon, AM. M. ; Yamaoka, H. ; Ishii, H. ; Hiraoka, N. ; Rueff, J.-P. ; Ablett, J. M. ; Imura, K. ; Suzuki, H. S. ; et al ( , Physical Review Letters)
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Lin, J. Q. ; Villar Arribi, P. ; Fabbris, G. ; Botana, A. S. ; Meyers, D. ; Miao, H. ; Shen, Y. ; Mazzone, D. G. ; Feng, J. ; Chiuzbăian, S. G. ; et al ( , Physical Review Letters)