Inverse Isotope Effect on Kondo Temperature in Electron-Rattling System
Inverse Isotope Effect on Kondo Temperature in Electron-Rattling System
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DOI：
10.1143/jpsj.78.073707
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发表时间：
2009-07-01
影响因子：
1.7
通讯作者：
Hotta, Takashi
中科院分区：
文献类型：
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作者：
Hotta, Takashi
在与非简谐声子耦合的电子系统中，即，通过对Anderson-Holstein模型的Sommerfeld常数γ的数值计算，发现近藤温度T-K存在着一种逆同位素效应。对于具有质量M的振子的非谐势，其中已经发现大伽马几乎与所施加的磁场无关，当M增加时，伽马被显著抑制，即，在Kondo问题中，由于γ与T-K（-1）的关系，T-K得到了增强，从而导致了T-K的逆同位素效应。由于这种现象不会发生谐波声子，它可以是一个关键的实验，以证明相关的振动磁鲁棒重电子态。
In an electron system coupled with anharmonic phonons, i.e., rattling, inverse isotope effect on the Kondo temperature T-K is found to occur by the numerical evaluation of the Sommerfeld constant gamma of the Anderson-Holstein model. For the anharmonic potential of an oscillator with mass M in which large gamma has been found to be almost independent of an applied magnetic field, gamma is significantly suppressed when M is increased, i.e., T-K is enhanced due to the relation of gamma similar to T-K(-1) in the Kondo problem, leading to the inverse isotope effect on T-K. Since this phenomenon does not occur for harmonic phonons, it can be a key experiment to prove the relevance of rattling to magnetically robust heavy electron state.