Quasi-Kondo phenomenon due to the dynamical Jahn-Teller effect

被引：41

作者：

Hotta, Takashi ^{[1
]}

机构：

[1] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.96.197201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 log2 is released, leading to quasi-Kondo behavior. We discuss a simple relation between the "Kondo" temperature and the JT energy.

引用

页数：4

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