Dynamical spin susceptibility in La2 CuO4 studied by resonant inelastic x-ray scattering

H. C. Robarts, M. Garcia-Fernandez, J. Li, A. Nag, A. C. Walters, N. E. Headings, S. M. Hayden*, Ke-Jin Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

Resonant inelastic x-ray scattering (RIXS) is a powerful probe of elementary excitations in solids. It is now widely applied to study magnetic excitations. However, its complex cross section means that RIXS has been more difficult to interpret than inelastic neutron scattering (INS). Here we report ∼37 meV resolution RIXS measurements of the magnetic excitations in La2CuO4, the antiferromagnetic parent of one system of high-temperature
superconductors. At high energies (∼2 eV), the RIXS spectra show angular-dependent dd orbital excitations in agreement with previous RIXS studies but show new structure. They are interpreted with single-site multiplet calculations. At low energies (0.3 eV), we model the wave-vector-dependent single magnon RIXS intensity as the product of the calculated single-ion spin-flip RIXS cross section and the dynamical structure factor
S(Q, ω) of the spin-wave excitations. When S(Q, ω) is extracted from our data, the wave-vector-dependence of the single-magnon pole intensity shows a similar variation to that observed by INS. Our results confirm that suitably corrected RIXS data can yield the genuine wave-vector and energy dependence of S(Q, ω) for a cuprate antiferromagnet. In addition to spin waves, our data show structured multimagnon excitations with dispersing peaks in the intensity at energies higher than the single-magnon excitations.
Original languageEnglish
Article number224427
Number of pages11
JournalPhysical Review B
Volume103
Issue number22
DOIs
Publication statusPublished - 21 Jun 2021

Bibliographical note

Funding Information:
We acknowledge J. van den Brink for fruitful discussions. The authors acknowledge funding and support from the Engineering and Physical Sciences Research Council (EPSRC) Centre for Doctoral Training in Condensed Matter Physics (CDT-CMP), Grant No. EP/L015544/1 as well as Grant No. EP/R011141/1. We acknowledge Diamond Light Source for providing the beamtime under the proposal SP18469 and the science commissioning time on the Beamline I21. We acknowledge Thomas Rice for the technical support throughout the beam time. We would also like to thank the Materials Characterisation Laboratory team for help on the Laue instrument in the Materials Characterisation Laboratory at the ISIS Neutron and Muon Source.

Publisher Copyright:
© 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Keywords

  • cond-mat.str-el
  • cond-mat.supr-con

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