Magnetic phases in the correlated Kondo-lattice model
Magnetic phases in the correlated Kondo-lattice model
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相关近藤晶格模型中的磁相
DOI：
10.1103/physrevb.76.245101
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发表时间：
2007
影响因子：
3.7
通讯作者：
T. Pruschke
中科院分区：
文献类型：
--
作者：
R. Peters;T. Pruschke
我们研究了扩展的近藤晶格模型的磁有序性，该模型在巡游态之间引入了额外的在位库仑相互作用。在动力学平均场理论中，采用Wilson的数值重整化群方法作为杂质求解器，求解了该模型。对于二分晶格，我们发现在一半填充预期的反铁磁相。在掺杂时，该相逐渐被抑制，并观察到相分离的迹象。对于大掺杂的模型表现出铁磁性，它的外观可以在第一眼被解释为Rudermann-Kittel-Kasuya-Yosida相互作用。然而，对于大的近藤耦合J，我们发现与Rudermann-Kittel-Kasuya-Yosida图有显著的不同，并且观察到局域自旋和带态之间的反铁磁近藤耦合的量子临界点的迹象.
We study magnetic ordering of an extended Kondo-lattice model including an additional on-site Coulomb interaction between the itinerant states. The model is solved in the dynamical mean-field theory using Wilson's numerical renormalization group approach as impurity solver. For a bipartite lattice we find at half filling the expected antiferromagnetic phase. Upon doping this phase is gradually suppressed and hints towards phase separation are observed. For large doping the model exhibits ferromagnetism, the appearance of which can at first sight be explained by Rudermann-Kittel-Kasuya-Yosida interaction. However, for large values of the Kondo coupling $J$ significant differences to a simple Rudermann-Kittel-Kasuya-Yosida picture can be found. We furthermore observe signs of quantum critical points for antiferromagnetic Kondo coupling between the local spins and band states.