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Coexistence of Insulatorlike Paramagnon and Metallic Spin-Orbit Exciton Modes in SrIrO3

E. Paris1,*, W. Zhang1, Y. Tseng1,2, A. Efimenko3, C. Sahle3, V. N. Strocov1, E. Skoropata1, K. Rolfs4, T. Shang4,5 et al.

J. Lyu4,6, E. Pomjakushina4, M. Medarde4, H. M. Rønnow7, B. Normand8,7, M. Radovic1, and T. Schmitt1,†

  • 1PSI Center for Photon Sciences, CH-5232 Villigen-PSI, Switzerland
  • 2Institute of Physics, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan
  • 3European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38043 Grenoble, France
  • 4PSI Center for Neutron and Muon Sciences, CH-5232 Villigen-PSI, Switzerland
  • 5Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China
  • 6CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • 7Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
  • 8PSI Center for Scientific Computing, Theory and Data, CH-5232 Villigen-PSI, Switzerland

  • *Contact author: eugenio.paris@psi.ch
  • †Contact author: thorsten.schmitt@psi.ch
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Phys. Rev. Lett. 135, 186506 – Published 31 October, 2025

DOI: https://doi.org/10.1103/96fl-5zlh

Abstract

We probe the spectrum of elementary excitations in SrIrO3 by using heterostructured [(SrIrO3)m/(SrTiO3)l] samples to approach the bulk limit. Our resonant inelastic x-ray scattering (RIXS) measurements at the Ir L3 edge reveal a robust low-lying collective magnetic mode with an antiferromagnetic (AFM) dispersion similar to the insulators Sr2IrO4 and Sr3Ir2O7, albeit with a large gap and much larger linewidth. At higher energies we find the spin-orbit exciton, also strongly broadened, but with an inverted dispersion and doubled periodicity that are controlled by the charge hopping. These results demonstrate that the AFM paramagnon persists, somewhat counterintuitively, far into the metallic regime of the insulator-metal transition driven by the degree of confinement in the heterostructure. We conclude that these two excitations, which are contrasting but coexisting hallmarks of strong AFM pseudospin and charge fluctuations in a spin-orbit-coupled Mott-Slater material, are properties intrinsic to the ground state of semimetallic perovskite SrIrO3.

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Phys. Rev. Lett. 135, 186506– Published 31 October, 2025
  • Received 11 December 2024
  • Revised 8 August 2025
  • Accepted 10 October 2025
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