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, GPa are displayed with solid circles. Low-spin (LS) and high-spin (HS) state configurations were computed at high pressure. The LS simulation is offset for clarity
, We lack here the knowledge of the magnetic order as x-ray spectroscopy are local probes. We performed neutron powder diffraction until ?12 GPa, yet did not detect a significant amount of the ortho-II phase in order to search for magnetic order (see Supplemental Material). This calls for neutron powder diffraction at even higher pressures
, We acknowledge SOLEIL for provision of synchrotron radiation facilities (proposal
Investissements d'Avenir" programme under reference ANR-11-IDEX-0004-02, and within the framework of the Cluster of Excellence MATISSE led by Sorbonne Université and from the LLB/SOLEIL PhD fellowship program. Sample synthesis and preparation was done by P.T. The XES/XAS experiment was performed by, for their help in the growth of the FeSe crystals using the CVT method. B.W.L acknowledges financial support from the French state funds managed by the ANR within the ,
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