Pressure-Driven Metal-Insulator Transition in Hematite from Dynamical Mean-Field Theory
- 7 April 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 102 (14), 146402
- https://doi.org/10.1103/physrevlett.102.146402
Abstract
The local density approximation combined with dynamical mean-field theory is applied to study the paramagnetic and magnetically ordered phases of hematite as a function of volume. As the volume is decreased, a simultaneous first-order insulator-metal and high-spin to low-spin transition occurs close to the experimental value of the critical volume. The high-spin insulating phase is destroyed by a progressive reduction of the spectral gap with increasing pressure, upon closing of which the high-spin phase becomes unstable. We conclude that the transition in at can be described as an electronically driven volume collapse.
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