Magnetic-field control of quantum critical points of valence transition.
Magnetic-field control of quantum critical points of valence transition.
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DOI：
10.1103/physrevlett.100.236401
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发表时间：
2008-04
影响因子：
8.6
通讯作者：
S. Watanabe;A. Tsuruta;K. Miyake;J. Flouquet
中科院分区：
文献类型：
--
作者：
S. Watanabe;A. Tsuruta;K. Miyake;J. Flouquet
我们研究了磁场如何控制一阶价态跃迁的关键终点的机制。我们证明临界温度被磁场抑制为量子临界点（QCP），并且出乎意料的是，QCP 在基态相图中表现出非单调场依赖性，甚至在中间价交叉区域也引起了亚磁性的出现。场致 QCP 的驱动力被阐明为塞曼效应和近藤效应的协同现象，这产生了与近藤温度不同的能量尺度。该机制解释了CeIrIn(5)中奇特的磁响应和YbXCu(4)中X=In时的变磁转变以及X=Ag和Cd之间的鲜明对比。
We study the mechanism of how critical end points of first-order valence transitions are controlled by a magnetic field. We show that the critical temperature is suppressed to be a quantum critical point (QCP) by a magnetic field, and unexpectedly, the QCP exhibits nonmonotonic field dependence in the ground-state phase diagram, giving rise to the emergence of metamagnetism even in the intermediate valence-crossover regime. The driving force of the field-induced QCP is clarified to be cooperative phenomena of the Zeeman and Kondo effects, which create a distinct energy scale from the Kondo temperature. This mechanism explains the peculiar magnetic response in CeIrIn(5) and the metamagnetic transition in YbXCu(4) for X=In as well as the sharp contrast between X=Ag and Cd.