Spin crossover and Mott—Hubbard transition under high pressure and high temperature in the low mantle of the Earth

30th International Conference on Interaction of Intense Energy Fluxes with Matter

Ovchinnikov, S.G.^1 ; Ovchinnikova, T.M.^2 ; Plotkin, V.V.^3 ; Dyad'Kov, P.G.^3

Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk

660036, Russia^1

Sukhachev Institute of Forest, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk

660036, Russia^2

Trofimuk Institute of Petroleum-Gas Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Academician Koptyug Avenue 3, Novosibirsk

630090, Russia^3

关键词: Calculated phase diagrams;    Effect of high pressure;    Electrical conductivity;    Electronic and structural properties;    Geomagnetic field data;    High pressure and high temperature;    Mott-hubbard transition;    Quantum phase transitions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/653/1/012095/pdf
DOI  :  10.1088/1742-6596/653/1/012095

来源: IOP

【 摘 要 】

Effect of high pressure induced spin crossover on the magnetic, electronic and structural properties of the minerals forming the Earth's low mantle is discussed. The low temperature P, T phase diagram of ferropericlase has the quantum phase transition point Pc= 56 GPa at T = 0 confirmed recently by the synchrotron Mössbauer spectroscopy. The LDA+GTB calculated phase diagram describes the experimental data. Its extension to the high temperature resulted earlier in prediction of the metallic properties of the Earth's mantle at the depth 1400 km