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Fractional Spin Exc...
Fractional Spin Excitations in the Infinite-Layer Cuprate CaCuO2
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- Martinelli, Leonardo (författare)
- Politecnico di Milano,Polytechnic University of Milan
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- Betto, Davide (författare)
- European Synchrotron Radiation Facility (ESRF)
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- Kummer, Kurt (författare)
- European Synchrotron Radiation Facility (ESRF)
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- Arpaia, Riccardo, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Braicovich, Lucio (författare)
- Politecnico di Milano,Polytechnic University of Milan,European Synchrotron Radiation Facility (ESRF)
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- Di Castro, Daniele (författare)
- Universita degli Studi di Roma Tor Vergata,University of Rome Tor Vergata
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- Brookes, Nicholas B. (författare)
- European Synchrotron Radiation Facility (ESRF)
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- Sala, Marco Moretti (författare)
- Politecnico di Milano,Polytechnic University of Milan
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- Ghiringhelli, Giacomo (författare)
- Politecnico di Milano,Polytechnic University of Milan
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(creator_code:org_t)
- 2022
- 2022
- Engelska.
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Ingår i: Physical Review X. - 2160-3308. ; 12:2
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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