Magnetic Collapse and Insulator-Metal Transitions in Some 3D Metal Oxides Under High Pressures
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Magnetic Collapse and Insulator-Metal Transitions in Some 3D Metal Oxides Under High Pressures Igor S. Lyubutin1, Alexander G. Gavriliuk2, and Viktor Struzhkin3 1 Institute of Crystallography, Russian Academy of Sciences, Leninskii prospekt 59, Moscow, 119333, Russian Federation 2 Institute for High Pressure Physics, Troitsk, Moscow region, 142190, Russian Federation 3 Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC, 20015
ABSTRACT In systems with strong electron correlations, many theories predict a high-pressureinduced 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. INTRODUCTION The properties and behavior of transition metal oxides are governed mostly by strong electron-electron correlations. By applying high pressure, it is possible to control the correlation effects. The compression provides an additional degree of freedom to modify the magnetic, structural, electronic and optical properties of solids. In systems with strong electron correlations, many theories predict high-pressure-induced insulator-metal transition (I-M), which is followed by the collapse of the localized magnetic moments and by a structural phase transition [1]. With the development of the high-pressure diamond-anvil-cell technique, the experimental investigations of such transitions are now possible to large extent due to the synchrotron radiation facilities. Transition metal oxides present a very large class of materials, which are important for both fundamental science and practical applications. They include high temperature superconductors, manganites with colossal magneto resistance, multiferroics, materials for spintronics and optoelectronics; the mixed iron oxides and perovskites are very important for geophysics. A variety of different electronic, magnetic, transport and optical properties, of the transition metal oxides provides the basis for a new type of electronics. In this report, the results of many last experiments on the influence of the high pressure on the magnetic and crystal structure as well as on the electronic and transport properties of 3d metal oxides are summarized. Several synchrotron radiation techniques have been applied to carry out the highpressure experiments with iron compound oxides having different crystal structures. The theoretical approaches are discussed in relation to the breakdown of strong d-d electronic correlations.
EXPERIMENT The cubic crystals of the nickel monoxide NiO, magn
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