Accession Number:
ADA010544
Title:
The Effect of Exchange on the Theory of the Order-Disorder and the Insulator-Metal Transitions in Magnetite, Fe3O4.
Descriptive Note:
Final rept.,
Corporate Author:
NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD
Personal Author(s):
Report Date:
1975-04-01
Pagination or Media Count:
36.0
Abstract:
Using a Hartree-Fock decoupled Hamiltonian, electronic energy bands for magnetite, Fe3O4 have been determined at temperatures in the neighborhood of the Verwey transition temperature. The cluster-variation method has been applied to determine the parameters appearing in the Hartree-Fock Hamiltonian. It was observed that the insulator-metal transition takes place at a temperature where the Verwey order is still finite although it is quite small. As long as the Verwey transition persists as a second order transition the theory here predicts two different distinct transition temperatures, one for the insulator-metal transition and the other for the order-disorder transition.
Descriptors:
Subject Categories:
- Solid State Physics