Competition between Hund-Rule Coupling and Kondo Effect
Competition between Hund-Rule Coupling and Kondo Effect
复制标题
百法则耦合与近藤效应的竞争
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
K. Miyake
中科院分区：
文献类型：
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作者：
H. Kusunose;K. Miyake
我们通过将 Wilson 数值重正化群方法应用于扩展 Kondo 模型，研究了杂化与洪德法则耦合之间的竞争问题，其中杂质自旋通过洪德法则耦合相互作用，并具有与传导电子隔离的额外自旋。结果表明，洪德法则耦合是对强耦合不动点的无关扰动。然而，洪德规则耦合使特征能量T K 急剧降低，并且由于洪德规则耦合的存在，描述低能物理的无关算子在额外自旋和近藤共振态之间呈现出铁磁交换相互作用的形式。
We investigate a problem about the competition between the hybridization and the Hund-rule coupling by applying the Wilson numerical renormalization-group method to the extended Kondo model where the impurity spin interacts via the Hund-rule coupling, with an extra spin which is isolated from the conduction electrons. It is shown that the Hund-rule coupling is an irrelevant perturbation against the strong coupling fixed point. However, the Hund-rule coupling decreases the characteristic energy T K drastically to the lower side and the irrelevant operator, which describes the low energy physics, takes a form of ferromagnetic exchange interaction between the extra spin and the Kondo resonance states because of the existence of the Hund-rule coupling.