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VOLUME 96 (2012) | ISSUE 2 | PAGE 135
Metallic layer inside the Earth's lower mantle
Abstract
We predict the insulator-metal-insulator transitions for the temperature and pressure of the lower mantle with the metal layer thickness \Delta h\approx 400 km at the depth of 1400-1800 km. The insulator-metal transition has the Mott-Hubbard origin, while the second transition from metal to insulator results from spin crossover of the Fe2+ ions from high spin S=2 to low spin S=0 state. The conductivity in the metal layer may attain 250 S/m. The depth profile of the conductivity is also suggested.