Influence of the four-spin exchange interaction on the magnetic properties of manganites
Influence of the four-spin exchange interaction on the magnetic properties of manganites
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DOI：
10.1088/0953-8984/17/37/023
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发表时间：
2005-09
期刊：
影响因子：
--
通讯作者：
S. Aplesnin;N. Piskunova
中科院分区：
文献类型：
--
作者：
S. Aplesnin;N. Piskunova
结果表明，应考虑非海森堡交换相互作用，仅使用有效的交换参数和自旋来重现 La1−xAxMnO3 (A = Ca,Sr) 的磁相图。四自旋交换的形成是由载流子跳跃引起的，并且与临界浓度金属-电介质转变一致。二自旋和四自旋交换参数由蒙特卡罗模拟确定。
It is shown that non-Heisenberg exchange interaction should be taken into account to reproduce the magnetic phase diagram of La1−xAxMnO3 (A = Ca,Sr) using only effective exchange parameters and spins. The formation of the four-spin exchange arises from carrier hopping and coincides with the critical concentration metal–dielectric transition. The two- and four-spin exchange parameters are determined by Monte Carlo simulations.