Resonant inelastic x-ray scattering study reveals marginal paramagnon energy changes in electron-doped cuprates, suggesting persistent electron correlation strength across varying doping levels.
We investigated the high energy spin excitations in electron-doped La₂₋ₓ Ceₓ CuO₄, a cuprate superconductor, by resonant inelastic x-ray scattering (RIXS) measurements. Efforts were paid to disentangle the paramagnon signal from non-spin-flip spectral weight mixing in the RIXS spectrum at Q\| = $(0.6π, 0)$ and $(0.9π, 0)$ along the (1 0) direction. Our results show that, for doping level x from 0.07 to 0.185, the variation of the paramagnon excitation energy is marginal. We discuss the implication of our results in connection with the evolution of the electron correlation strength in this system.
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Li et al. (2023) studied this question.
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