Synchrotron Moessbauer Spectroscopy and Resistivity Studies of Iron Oxide Under High Pressure
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Synchrotron Moessbauer Spectroscopy and Resistivity Studies of Iron Oxide Under High Pressure Viktor V. Struzhkin1, Mikhail I. Eremets2, Ivan M. Eremets1, Jung-Fu Lin3, Wolfgang Sturhahn4, Jiyong Zhao4, and Michael Y Hu5 1 Carnegie Institution of Washington, Washington, DC, 20015 2 Max Planck Institut für Chemie, Mainz, 55020, Germany 3 Lawrence Livermore National Laboratory, Livermore, CA, 94550 4 Advanced Photon Source, Argonne National laboratory, Argonne, IL, 60439 5 HPCAT, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439
ABSTRACT The strong electron correlations play a crucial role in the formation of a variety of electronic and magnetic properties of the transition metal oxides. In strongly correlated electronic materials many theoretical predictions exist on pressure-induced insulator-metal transitions, which are followed by a collapse of localized magnetic moments and by structural phase transitions [1]. The high-pressure studies provide additional degree of freedom to control the structural, electronic, optical, and magnetic properties of transition metal oxides. With the development of the high-pressure diamond-anvil-cell technique the experimental studies of such transitions are now possible with the advanced synchrotron techniques. In our studies, the iron monooxide Fe0.94O was studied under high pressures up to 200 GPa in diamond anvil cells. The single crystals enriched with Fe57 isotopes have been prepared for nuclear resonance measurements. The results of synchrotron Mössbauer spectroscopy (nuclear forward scattering NFS), and electro-resistivity measurements suggest a complicated scenario of magnetic interactions governed by band-broadening effects. INTRODUCTION The active topic of current research in systems with strong electron correlations is highpressure-induced insulator-metal transition (I-M), which is accompanied by the collapse of the magnetic moments [1]. The oxides of transition metals 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, heavy fermion and Kondo systems. A variety of different electronic, magnetic, transport and optical properties in these materials provides the basis for a new type of applications in electronics and optoelectronics. The studies of oxides and perovskites doped with iron are very important for understanding the deep Earth’s interior composition and properties [1]. Compression of a solid presents a natural means to tune interatomic distances and induce a variety of transitions (e. g. insulator-metal transitions, spin-crossover transitions) in correlated materials. The most widely used technique for this purpose - diamond anvil cell (DAC) technology - has developed rapidly over the past few years [2,3]. A number of techniques, which were previously limited to ambient pressure (because of the requirement of a large sample
volume) may now be used at high and even ultra
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