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arXiv 0810.1771cond-mat.str-elcond-mat.mes-hall
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近藤退相干:寻找金和银中铁杂质的正确自旋模型

Kondo decoherence: finding the right spin model for iron impurities in gold and silver

T. A. Costi, L. Bergqvist, A. Weichselbaum, J. von Delft, T. Micklitz, A. Rosch, P. Mavropoulos, P. H. Dederichs, F. Mallet, L. Saminadayar, C. Bauerle

摘要:

我们利用退相干的电子由于磁性杂质,通过弱局域化研究,解决一个长期存在的问题,关于经典的近藤系统的Fe杂质的贵金属金和银:近藤型模型产生一个现实的描述相关的多个频带,自旋和轨道自由度?先前的研究表明了一个完全筛选的旋转$S$ Kondo模型,但$S$的值仍然不明确。我们进行密度泛函理论计算,建议$S = 3/2$。我们还比较了以前和新的测量的电阻率和退相干率在准1维导线的数值重整化群预测$S=1/2,1$和3/2,发现很好的协议$S=3/2$。

英文摘要:

We exploit the decoherence of electrons due to magnetic impurities, studied via weak localization, to resolve a longstanding question concerning the classic Kondo systems of Fe impurities in the noble metals gold and silver: which Kondo-type model yields a realistic description of the relevant multiple bands, spin and orbital degrees of freedom? Previous studies suggest a fully screened spin $S$ Kondo model, but the value of $S$ remained ambiguous. We perform density functional theory calculations that suggest $S = 3/2$. We also compare previous and new measurements of both the resistivity and decoherence rate in quasi 1-dimensional wires to numerical renormalization group predictions for $S=1/2,1$ and 3/2, finding excellent agreement for $S=3/2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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