Effect of spin crossovers on the Mott-Hubbard transition at high pressures

被引：36
|
作者：
Ovchinnikov, S. G. [1 ,2 ]
机构：
[1] Russian Acad Sci, Siberian Branch, Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[2] Siberian Fed Univ, Krasnoyarsk 660041, Russia
来源：
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS | 2008年 / 107卷 / 01期
基金：
俄罗斯基础研究基金会;
关键词：
D O I：
10.1134/S1063776108070145
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The effect of spin crossovers in d (n) terms on the effective Hubbardparameter (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)).
引用
收藏
页码：140 / 146
页数：7
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