Quantum Criticality and Emergence of the T/B Scaling in Strongly Correlated Metals
Quantum Criticality and Emergence of the T/B Scaling in Strongly Correlated Metals
复制标题
强相关金属中的量子临界性和 T/B 标度的出现
DOI：
10.1016/j.jmmm.2015.09.042
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Watanabe and K. Miyake
中科院分区：
文献类型：
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作者：
S. Watanabe and K. Miyake
本文从理论上研究了在重电子金属β-YbAlB_4中观察到的一种新的标度，其中磁化率表示为温度T与磁场B之比的单一标度函数。我们发展了磁场作用下Yb临界价态涨落的模式耦合理论，证实了在价态跃迁的QCP附近存在T/B标度行为。T/B标度的出现表明由于强的局域关联效应，Yb临界价态涨落存在一个小的特征温度。讨论了用量子价临界性统一解释T/B标度和非常规临界性的问题。
A new type of scaling observed in heavy-electron metalβ-YbAlB4, where the magnetic susceptibility is expressed as a single scaling function of the ratio of temperatureTand magnetic fieldBover four decades, is examined theoretically. We develop the mode-coupling theory for critical Yb-valence fluctuations under a magnetic field, verifying that theT/Bscaling behavior appears near the QCP of the valence transition. Emergence of theT/Bscaling indicates the presence of the small characteristic temperature of the critical Yb-valence fluctuation due to the strong local correlation effect. It is discussed that theT/Bscaling as well as the unconventional criticality is explained from the viewpoint of the quantum valence criticality in a unified way.