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Distribution of critical temperature at Anderson localization

机译:安德森局部化时的临界温度分布

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摘要

Based on a local mean-field theory approach at Anderson localization, we find a distribution function of critical temperature from that of disorder. An essential point of this local mean-field theory approach is that the information of the wave-function multifractality is introduced. The distribution function of the Kondo temperature (T_K) shows a power-law tail in the limit of T_K→ 0 regardless of the Kondo coupling constant. We also find that the distribution function of the ferromagnetic transition temperature (T_c) gives a power-law behavior in the limit of T_c → 0 when an interaction parameter for ferromagnetic instability lies below a critical value. However, the T_c distribution function stops the power-law increasing behavior in the T_c → 0 limit and vanishes beyond the critical interaction parameter inside the ferromagnetic phase. These results imply that the typical Kondo temperature given by a geometric average always vanishes due to finite density of the distribution function in the T_K → 0 limit while the typical ferromagnetic transition temperature shows a phase transition at the critical interaction parameter. We propose that the typical transition temperature serves a criterion for quantum Griffiths phenomena vs smeared transitions: Quantum Griffiths phenomena occur above the typical value of the critical temperature while smeared phase transitions result at low temperatures below the typical transition temperature. We speculate that the ferromagnetic transition at Anderson localization shows the evolution from quantum Griffiths phenomena to smeared transitions around the critical interaction parameter at low temperatures.
机译:基于安德森局部化的局部均值理论方法,我们从无序中找到了临界温度的分布函数。这种局部平均场理论方法的要点是引入了波函数多重分形的信息。无论近藤耦合常数如何,近藤温度的分布函数(T_K)都在T_K→0的极限范围内显示幂律尾部。我们还发现,当铁磁不稳定性的相互作用参数低于临界值时,铁磁转变温度(T_c)的分布函数在T_c→0的极限内给出幂律行为。但是,T_c分布函数停止了T_c→0极限中的幂律增加行为,并消失了,超过了铁磁相内部的临界相互作用参数。这些结果表明,由于T_K→0极限中分布函数的有限密度,由几何平均值给出的典型近藤温度始终消失,而典型的铁磁转变温度在临界相互作用参数下显示出相变。我们提出典型的转变温度是衡量量子格里菲斯现象与弥散转变的标准:量子格里菲斯现象发生在临界温度的典型值以上,而弥散相变则是在低于典型转变温度的低温下产生的。我们推测,在安德森局部的铁磁跃迁显示出在低温下从量子格里菲斯现象到临界相互作用参数周围的弥散跃迁的演化。

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  • 来源
    《Physical review》 |2016年第20期|205128.1-205128.11|共11页
  • 作者

    Rayda Gammag; Ki-Seok Kim;

  • 作者单位

    Asia Pacific Center for Theoretical Physics, POSTECH, Pohang, Gyeongbuk 790-784, Korea,Max Plank POSTECH Center for Complex Phase Materials, POSTECH, Pohang 790-784, Korea;

    Department of Physics, POSTECH, Pohang, Gyeongbuk 790-784, Korea,Institute of Edge of Theoretical Science, POSTECH, Pohang, Gyeongbuk 790-784, Korea;

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