title: Novel pressure-induced magnetic transition in magnetite (Fe3O4).
abstract: Fe K-edge x-ray magnetic circular dichroism of magnetite (Fe3O4) powders was measured with synchrotron radiation under variable pressure and temperature conditions in diamond anvil cell. The magnetic dichroism was observed to decrease discontinuously by approximately 50% between 12 and 16 GPa, independent of temperature. The magnetic transition is attributed to a high-spin to intermediate-spin transition of Fe2+ ions in the octahedral sites and could account for previously observed structural and electrical anomalies in magnetite at this pressure range. The interpretation of x-ray magnetic circular dichroism data is supported by x-ray emission spectroscopy and theoretical cluster calculations.
authors: HPSynC, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, USA. yangding@aps.anl.gov
authors: Yang
authors: Y
authors: Ding
authors: Daniel
authors: D
authors: Haskel
authors: Sergei G
authors: SG
authors: Ovchinnikov
authors: Yuan-Chieh
authors: YC
authors: Tseng
authors: Yuri S
authors: YS
authors: Orlov
authors: Jonathan C
authors: JC
authors: Lang
authors: Ho-kwang
authors: HK
authors: Mao