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Figure 5
(a) The formation of a spinel phase at the expense of a layered phase in a Li- and Mn-rich cathode along the first charge quantified by Mn K-edge EXAFS. Mn Kβ emission spectroscopy of the averaged Mn local magnetic moment as a function of the charge state has been quantified and three Mn electronic phases have been detected. The local Mn magnetic moments have been extracted by the integral of the absolute difference [IAD method (Lafuerza et al., 2020BB20)] with respect to a reference. The union of the two results allowed access to the cationic contribution and, knowing the charge state indirectly, also to the anionic contribution, for the charge compensation mechanism (Ali et al., 2022BB2). (b) The chalcogen height and the local Fe magnetic moment relatively followed by the IAD with respect to the 10 K spectra in an Fe-based superconductor show a similar discontinuity across the superconducting temperature (around 30 K), providing clear evidence of the interplay between the electronic, lattice and magnetic degrees of freedom in these materials (Stramaglia et al., 2021BB30). (c) RIXS map collected at the Ir L3-edge over an Ir-based double perovskite compound with an energy step in both incoming and outgoing energy of 0.33 eV and a global energy resolution of around 1 eV (FWHM of the quasi-elastic line) (Bandyopadhyay et al., 2019BB4). Local and charge transfer electronic excitations are clearly visible around 3, 6 and 9.5 eV of energy transfer (brighter color).

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