High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems

被引：187
作者：
Werner, Philipp [1 ]
Millis, Andrew J. [1 ]
机构：
[1] Columbia Univ, New York, NY 10027 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 12期
关键词：
D O I：
10.1103/PhysRevLett.99.126405
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the interplay of crystal field splitting and Hund coupling in a two-orbital model which captures the essential physics of systems with two electrons or holes in the e(g) shell. We use single site dynamical mean field theory with a recently developed impurity solver, which is able to access strong couplings and low temperatures. The fillings of the orbitals and the location of phase boundaries are computed as a function of Coulomb repulsion, exchange coupling, and crystal field splitting. We find that the Hund coupling can drive the system into a novel Mott insulating phase with vanishing orbital susceptibility. Away from half-filling, the crystal field splitting can induce an orbital selective Mott state.
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页数：4
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