Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.156402
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Early Career Award Program [1047478]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC00112704]
- MOST of China [2015CB921302]
- CAS of China [XDB07020200]
- Swiss National Science Foundation through the Sinergia network Mott Physics Beyond the Heisenberg (MPBH) model
- Engineering and Physical Sciences Research Council [EP/J012912/1] Funding Source: researchfish
- EPSRC [EP/J012912/1] Funding Source: UKRI
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We report the first empirical demonstration that resonant inelastic x-ray scattering (RIXS) is sensitive to collective magnetic excitations in S = 1 systems by probing the Ni L-3 edge of La2-xSrxNiO4 (x = 0, 0.33, 0.45). The magnetic excitation peak is asymmetric, indicating the presence of single and multi-spin-flip excitations. As the hole doping level is increased, the zone boundary magnon energy is suppressed at a much larger rate than that in hole doped cuprates. Based on the analysis of the orbital and charge excitations observed by RIXS, we argue that this difference is related to the orbital character of the doped holes in these two families. This work establishes RIXS as a probe of fundamental magnetic interactions in nickelates opening the way towards studies of heterostructures and ultrafast pump-probe experiments.
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