Abstract
The main objective of this paper is the study of structural aspects of strongly correlated systems in conjunctions with magnetic/electronic properties in a regime of matter under very high density. Synchrotron X-ray diffraction (XRD) measurements were carried out to 130 GPa to probe structural features specifically related to pressure-induced (PI) magnetic/electronic transitions in selected transition metal (TM) compounds, emphasizing those with geophysical interest. The types of electronic transitions discussed are the Mott transition (MT), and high-spin (HS) to low-spin (LS) crossover. In these cases the electronic transition may induce or be a consequence of structural alterations. For instance a first-order PI spin-crossover will be accompanied by an abrupt reduction of the TM ionic-radius, hence by a discontinuous volume decrease. On the other hand a “sluggish” or second-order spin-crossover may result in non-linear crystal elastic constants which will affect the equation of state. In case of a MT, a fundamental electronic process in which a strongly correlated magnetic-insulating system becomes non-magnetic and metallic, one expects major modifications of the lattice parameters or even structural symmetry changes. As example-cases we present results in Fe2O3, Fe3O4, FeI2, FeCr2S4, and the RFeO3 orthoferrites (R=rare earth).
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