High pressure collapse of magnetism in Fe0.94O: Mössbauer spectroscopy beyond 100 GPa

M. P. Pasternak, R. D. Taylor, R. Jeanloz, X. Li, J. H. Nguyen, C. A. Mc Cammon

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Abstract

First studies of Mössbauer spectroscopy to pressures above 100 GPa are reported. The magnetic state of Fe0.94O was investigated to 120 GPa at T≤300K. At 300 K a diamagnetic low-spin (LS) state of Fe2+ is detected at 90 GPa; its abundance increases with P. The gap between the 5T2g high-spin ground state and the 1A1g LS excited state decreases with increasing P and at 120 GPa the LS species, first observed at 70 K, is fully converted at 450K. The magnetic collapse of Fe1-xO is an isochoric, second-order transition resulting from a gradual increase in the crystal-field with increasing pressure.

Original languageEnglish
Pages (from-to)5046-5049
Number of pages4
JournalPhysical Review Letters
Volume79
Issue number25
DOIs
StatePublished - 1 Jan 1997

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