Low-Temperature Magnetic Properties of the Kondo Lattice Model in One Dimension
Low-Temperature Magnetic Properties of the Kondo Lattice Model in One Dimension
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DOI：
10.7566/jpsj.84.044702
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发表时间：
2014-09
影响因子：
1.7
通讯作者：
S. Minami;H. Kawamura
中科院分区：
文献类型：
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作者：
S. Minami;H. Kawamura
利用Monte Carlo方法结合精确对角化技术研究了具有经典局域自旋的一维Kondo晶格模型的低温磁性。比较模拟还作出了RKKY经典海森堡模型已知的微扰导出的弱耦合极限。除了以前确定的反铁磁，铁磁和共面螺旋相位，手征非共面相位和共线相位的周期-4和6是新确定的，这两个都没有实现在相应的RKKY模型。即使在1/4和3/4填充的弱耦合极限下，4周期共线相位也持续存在，使这些填充的微扰方法无效。
Low-temperature magnetic properties of the one-dimensional Kondo-lattice model with classical localized spins are investigated by means of a Monte Carlo simulation combined with an exact diagonalization technique. Comparative simulations are also made for the RKKY classical Heisenberg model known to be perturbatively derived in the weak-coupling limit. In addition to the previously identified antiferromagnetic, ferromagnetic and coplanar helical phases, the chiral noncoplanar phase and the collinear phases of the period-4 and 6 are newly identified, neither of which is realized in the corresponding RKKY model. The period-4 collinear phase persists even in the weak-coupling limit at the 1/4- and 3/4-fillings, invalidating the perturbative approach at these fillings.