Quantum criticality and emergence of the T/B scaling in strongly correlated metals

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• 作者：Shinji Watanabe^a ; ; Kazumasa Miyake^b
• 关键词：Quantum criticality ; β-YbAlB4 ; T/B scaling ; Critical valence fluctuation
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：400
• 期：Complete
• 页码：13-16
• 全文大小：367 K

文摘

A new type of scaling observed in heavy-electron metal β-YbAlB₄, where the magnetic susceptibility is expressed as a single scaling function of the ratio of temperature T and magnetic field B over four decades, is examined theoretically. We develop the mode-coupling theory for critical Yb-valence fluctuations under a magnetic field, verifying that the T/B scaling behavior appears near the QCP of the valence transition. Emergence of the T/B scaling 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 the T/B scaling as well as the unconventional criticality is explained from the viewpoint of the quantum valence criticality in a unified way.