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Many-body physics of single and double spin-flip excitations in NiO

Understanding many-body physics of elementary excitations has advanced our control over material properties. Here, we study spin-flip excitations in NiO using Ni L3-edge resonant inelastic x-ray scattering (RIXS) and present a strikingly different resonant energy behavior between single and double s...

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Main Authors: Nag, Abhishek (Author) , Robarts, H. C. (Author) , Wenzel, Fabian (Author) , Li, J. (Author) , Elnaggar, Hebatalla (Author) , Wang, Ru-Pan (Author) , Walters, A. C. (Author) , García-Fernández, M. (Author) , Groot, F. M. F. de (Author) , Haverkort, Maurits W. (Author) , Zhou, Ke-Jin (Author)
Format: Article (Journal)
Language:English
Published: 13 February 2020
In: Physical review letters
Year: 2020, Volume: 124, Issue: 6
ISSN:1079-7114
DOI:10.1103/PhysRevLett.124.067202
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.124.067202
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.124.067202
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Author Notes:Abhishek Nag, H.C. Robarts, F. Wenzel, J. Li, Hebatalla Elnaggar, Ru-Pan Wang, A.C. Walters, M. García-Fernández, F.M.F. de Groot, M.W. Haverkort, and Ke-Jin Zhou
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Summary:Understanding many-body physics of elementary excitations has advanced our control over material properties. Here, we study spin-flip excitations in NiO using Ni L3-edge resonant inelastic x-ray scattering (RIXS) and present a strikingly different resonant energy behavior between single and double spin-flip excitations. Comparing our results with single-site full-multiplet ligand field theory calculations we find that the spectral weight of the double-magnon excitations originates primarily from the double spin-flip transition of the quadrupolar RIXS process within a single magnetic site. Quadrupolar spin-flip processes are among the least studied excitations, despite being important for multiferroic or spin-nematic materials due to their difficult detection. We identify intermediate state multiplets and intra-atomic core-valence exchange interactions as the key many-body factors determining the fate of such excitations. RIXS resonant energy dependence can act as a convincing proof of existence of nondipolar higher-ranked magnetic orders in systems for which, only theoretical predictions are available.
Item Description:Gesehen am 30.03.2020
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.124.067202

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