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Combining the methods of Mössbauer spectroscopy, synchrotron XRD, and resistivity and using diamond-anvil cells enables the discovery and studies of new phenomena in magnetism and electronic correlation at high density. It is shown that Hund's rule concerning the high-spin state in TM-compounds does not hold in this regime resulting in spin-crossover and collapse of the magnetic state for even-valence...
Anhydrous FeCl2 has been studied by 57Fe Mössbauer effect up to 61 GPa and at 5<T<300 K using diamond-anvil-cells. In the 3.5–31 GPa range an average hyperfine field of ∼1.2 T is observed, attributed to mutual cancellation of Fermi-contact and orbital terms. At P≥34 GPa the orbital term is abruptly quenched resulting in enhanced hyperfine field. At P>42 GPa the onset of a diamagnetic phase...
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