In systems with strong electron correlations, many theories predict a high-pressure-induced insulator-metal transition, which is followed by a collapse of the localized magnetic moments and structural phase transition. In this report, results of many last experiments on the influence of high pressure on the magnetic and crystal structure as well as on the electronic and transport properties of 3d metal oxides are summarized. Along with x-ray diffraction, optical absorption, Raman scattering and electroresistivity measurements, several synchrotron radiation techniques have also been applied to perform the high-pressure experiments with iron compound oxides having different crystal structures.
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