Effect of spin crossovers on the Mott-Hubbard transition at high pressures |
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Authors: | S G Ovchinnikov |
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Institution: | (1) Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia;(2) Siberian Federal University, Krasnoyarsk, 660041, Russia |
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Abstract: | The effect of spin crossovers in d n terms on the effective Hubbard parameter (U eff) determining the gap between the lower and upper Hubbard bands is analyzed using a many-electron approach to describe the electron structure of Mott insulators. A new mechanism of the insulator-metal transition is established for d 5 ions, which is related to a decrease in U eff caused by spin crossover. For other ions, the U eff value is either independent of pressure (d 2, d 4, d 7) or it exhibits nonmonotonic growth (d 3, d 6, d 8). |
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