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首页> 外文期刊>Physical review >Topological basis for understanding the behavior of the heavy-fermion metal β-YbAlB_4 under application of magnetic field and pressure
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Topological basis for understanding the behavior of the heavy-fermion metal β-YbAlB_4 under application of magnetic field and pressure

机译：理解重铁金属β-YbAlB_4在磁场和压力作用下的行为的拓扑基础

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摘要

Informative recent measurements on the heavy-fermion metal β-YbAlB_4 performed with applied magnetic field and pressure as control parameters are analyzed with the goal of establishing a sound theoretical explanation for the inferred scaling laws and non-Fermi-liquid (NFL) behavior, which demonstrate some unexpected features. Most notably, the robustness of the NFL behavior of the thermodynamic properties and of the anomalous T~(3/2) temperature dependence of the electrical resistivity under applied pressure P in zero magnetic field is at variance with the fragility of the NFL phase under application of a field B. We show that a consistent topological basis for this combination of observations, as well as the empirical scaling laws, may be found within fermion-condensation theory in the emergence and destruction of a flat band, and explains that the paramagnetic NFL phase takes place without magnetic criticality, not from quantum critical fluctuations. Schematic T - B and T - P phase diagrams are presented to illuminate this scenario.
机译：为了建立合理的理论解释，解释推断的水垢定律和非费米液体（NFL）行为，我们对以重磁场和β-YbAlB_4施加的磁场和压力为控制参数的最新信息进行了分析。展示一些意想不到的功能。最值得注意的是，在零磁场下施加压力P时，热力学性质的NFL行为的稳健性和电阻率的异常T〜（3/2）温度依赖性与在施加NFL相的脆性方面存在差异我们证明，在费米子凝聚理论中，在平坦带的出现和破坏中，可以找到这种观察结果组合的一致拓扑基础以及经验标度定律，并解释了顺磁NFL相发生时没有磁临界，也不是由量子临界波动引起的。给出了示意性的T-B和T-P相图，以阐明这种情况。

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  • 来源
    《Physical review》 |2016年第20期|205126.1-205126.5|共5页
  • 作者

    V. R. Shaginyan; A. Z. Msezane; K. G. Popov; J. W. Clark; V. A. Khodel; M. V. Zverev;

  • 作者单位

    Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina 188300, Russia,Clark Atlanta University, Atlanta, Georgia 30314, USA;

    Clark Atlanta University, Atlanta, Georgia 30314, USA;

    Komi Science Center, Ural Division, RAS, Syktyvkar 167982, Russia,Department of Physics, St. Petersburg State University, St. Petersburg 198504, Russia;

    McDonnell Center for the Space Sciences and Department of Physics, Washington University, St. Louis, Missouri 63130, USA,Centro de Ciencias Matematicas, Universidade de Madeira, 9000-390 Funchal, Madeira, Portugal;

    NRC Kurchatov Institute, Moscow 123182, Russia,McDonnell Center for the Space Sciences and Department of Physics, Washington University, St. Louis, Missouri 63130, USA;

    NRC Kurchatov Institute, Moscow 123182, Russia,Moscow Institute of Physics and Technology, Dolgoprudny, Moscow District 141700, Russia;

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