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Many-Body Physics of Single and Double Spin-Flip Excitations in NiO
Physical Review Letters ( IF 9.227 ) Pub Date : 2020-02-13 , DOI: 10.1103/physrevlett.124.067202
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

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.
更新日期:2020-02-13

 

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