Effect of very high pressure on the magnetic state of transition metal compounds |
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| Authors: | Moshe P Pasternak Gregory Kh Rozenberg Weiming M Xu R Dean Taylor |
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| Institution: | 1. School of Physics and Astronomy , Tel Aviv University , 69978, Tel Aviv, Israel moshepa@post.tau.ac.il;3. School of Physics and Astronomy , Tel Aviv University , 69978, Tel Aviv, Israel;4. MST-10, Los Alamos National Laboratory , Los Alamos, NM 87545, USA |
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| Abstract: | By simultaneously combining the methods of X-ray diffraction for structural phase transitions and EOS measurements, 57Fe Mössbauer spectroscopy as a site-sensitive probe, and resistivity measurements for studying insulating-metal transitions, we are able to study the effect of extreme pressures and at varying temperature on magnetic and electronic properties of transition metal compounds. Studies are carried out with specially tailored diamond anvils and diamond anvil cells, reaching pressures beyond 100?GPa. From our studies, we can investigate the most basic phenomenon of the quantum effect of magnetism in insulating antiferromagnets, the Mott insulators, such as high to low spin crossovers, quenching of the magnetic moments' orbital term, and the collapse of the Mott–Hubbard state. Examples of these phenomena will be given in cases of ferrous and ferric oxides, ferrous-halides and the rare-earth iron perovskites. |
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| Keywords: | High-pressure Magnetism Transition-metal compound Phase-transition Correlated-system Hyperfine-interaction |
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