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  • Martinelli, LeonardoPolitecnico di Milano,Polytechnic University of Milan (author)

Fractional Spin Excitations in the Infinite-Layer Cuprate CaCuO2

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • 2022
  • electronicrdacarrier

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  • LIBRIS-ID:oai:research.chalmers.se:01d955a2-3127-407d-bc45-ee560e7f6be4
  • https://doi.org/10.1103/PhysRevX.12.021041DOI
  • https://research.chalmers.se/publication/530831URI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We use resonant inelastic x-ray scattering (RIXS) to investigate the magnetic dynamics of the infinite-layer cuprate CaCuO2. We find that close to the (1/2,0) point, the single magnon decays into a broad continuum of excitations accounting for about 80% of the total magnetic spectral weight. Polarization-resolved RIXS spectra reveal the overwhelming dominance of the spin-flip (Delta S = 1) character of this continuum with respect to the Delta S = 0 multimagnon contributions. Moreover, its incident-energy dependence is identical to that of the magnon, supporting a common physical origin. We propose that the continuum originates from the decay of the magnon into spinon pairs, and we relate it to the exceptionally high ring exchange J(c) similar to J(1) of CaCuO2. In the infinite-layer cuprates, long-range and multisite hopping integrals are very important, and they amplify the 2D quantum magnetism effects in spite of the 3D antiferromagnetic Neel order.

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  • Betto, DavideEuropean Synchrotron Radiation Facility (ESRF) (author)
  • Kummer, KurtEuropean Synchrotron Radiation Facility (ESRF) (author)
  • Arpaia, Riccardo,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)arpaia (author)
  • Braicovich, LucioPolitecnico di Milano,Polytechnic University of Milan,European Synchrotron Radiation Facility (ESRF) (author)
  • Di Castro, DanieleUniversita degli Studi di Roma Tor Vergata,University of Rome Tor Vergata (author)
  • Brookes, Nicholas B.European Synchrotron Radiation Facility (ESRF) (author)
  • Sala, Marco MorettiPolitecnico di Milano,Polytechnic University of Milan (author)
  • Ghiringhelli, GiacomoPolitecnico di Milano,Polytechnic University of Milan (author)
  • Politecnico di MilanoEuropean Synchrotron Radiation Facility (ESRF) (creator_code:org_t)

Related titles

  • In:Physical Review X12:22160-3308

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