Electronic State of the Anderson Lattice over the Whole Temperature Range
Electronic State of the Anderson Lattice over the Whole Temperature Range
复制标题
整个温度范围内安德森晶格的电子状态
DOI：
10.1143/jpsj.60.3475
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发表时间：
1991
影响因子：
1.7
通讯作者：
Y. Kuroda
中科院分区：
文献类型：
--
作者：
Y. Ono;T. Matsuura;Y. Kuroda
在此之前，我们提出了一种改进的Anderson晶格模型，在该模型中，即使在自旋轨道简并N的大极限下，也可以适当地包含场间相干效应，并在极限N→∞下严格地研究了低温费米液体的性质。在本研究中，使用与上述相同的模型，我们通过N =6的显式数值计算来研究整个温度范围内的性质。我们发现相干温度t0的数量级为近藤温度tk的十分之一；在较低温度\(T\lesssim{T}_{0}\)下，系统处于费米液态，而在较高温度T ～ T ～ 0下，电子被近藤杂质非相干散射。在中等温度下，随着T的增加，在\(T\gtrsim{T}_{0}\)处出现的杂化隙迅速减小，然后在T→T→K处平滑地转变为伪杂化隙，最终在\(T\gtrsim{T}_{\text{K}}\)处实现密集的近藤态。
Earlier we proposed a modified version of the Anderson lattice model where the intersite coherence effects can be properly included even in the large limit of the spin-orbital degeneracy N and investigated the low temperature Fermi liquid properties rigorously in the limit N →∞. In the present study, using the same model as above, we investigate properties over the whole temperature range through explicit numerical calculations for N =6. We find that a coherence temperature T 0 of order of one tenth of the Kondo temperature T K exists; at lower temperature \(T\lesssim{T}_{0}\) the system is in the Fermi liquid state, while at higher temperature T ≫ T 0 the electrons are scattered incoherently by the Kondo impurities. At intermediate temperature, with increasing T , the hybridization gap appeared in the Fermi liquid state decreases rapidly at \(T\gtrsim{T}_{0}\), then smoothly turns into the pseudo gap at T ≃ T K , and finally the dense Kondo regime is realized at \(T\gtrsim{T}_{\text{K}}\).