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High Pressure Research
An International Journal
Volume 24, 2004 - Issue 1
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Original Articles

Effect of very high pressure on the magnetic state of transition metal compounds

, , &
Pages 33-43 | Received 16 May 2003, Accepted 25 Aug 2003, Published online: 08 Jun 2010
 

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.

Acknowledgement

This work was partially supported by grants from the Israel Science Foundation.

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