Quasi-Kondo phenomenon due to the dynamical Jahn-Teller effect.
Quasi-Kondo phenomenon due to the dynamical Jahn-Teller effect.
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DOI：
10.1103/physrevlett.96.197201
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发表时间：
2005-09
影响因子：
8.6
通讯作者：
T. Hotta
中科院分区：
文献类型：
--
作者：
T. Hotta
基于多轨道安德森模型和动力学Jahn-Teller（JT）声子耦合，提出了近藤效应的一种机制。与JT声子动态耦合的电子系统具有双简并振动基态，由于顺时针和逆时针旋转模式，熵为log 2。当温度低于改变旋转方向的特征能量时，旋转自由度最终被抑制，相应的熵被释放，导致准近藤行为。讨论了近藤温度与JT能之间的简单关系。
A mechanism of the nonmagnetic Kondo effect is proposed on the basis of a multiorbital Anderson model coupled with dynamical Jahn-Teller (JT) phonons. An electron system coupled dynamically with JT phonons has a vibronic ground state with double degeneracy due to clockwise and anticlockwise rotational modes with entropy of log2. When a temperature is lower than a characteristic energy to turn the rotational direction, the rotational degree of freedom is eventually suppressed and the corresponding entropy is released, leading to quasi-Kondo behavior. We discuss a simple relation between the "Kondo" temperature and the JT energy.