Breakdown of the mott-hubbard state in Fe2O3: A first-order insulator-metal transition with collapse of magnetism at 50 gpa

M. P. Pasternak, G. Kh Rozenberg, G. Yu Machavariani, O. Naaman, R. D. Taylor, R. Jeanloz

Research output: Contribution to journalArticlepeer-review

Abstract

Electronic and structural properties of the high-pressure phase of Fe2O3 were determined by combining the methods of Mössbauer spectroscopy, x-ray diffraction, and electrical resistance, R(P, T), to 80 GPa. Because of a first-order phase transition taking place in the 50–75 GPa range and accompanied by a volume decrease of ˜10%, a breakdown of the electronic d-d correlation occurred, leading to a Mott transition, a metallic and a nonmagnetic single Fe3+ electronic state. The high-pressure structure is of the distorted Rh2O3 - II type. The accommodation of the denser phase within this six-coordinated structure is attributable to the metallic state.

Original languageEnglish
Pages (from-to)4663-4666
Number of pages4
JournalPhysical Review Letters
Volume82
Issue number23
DOIs
StatePublished - 1999

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