论文标题
二维超导体中量子格里菲斯奇异性的激活缩放行为
The activated scaling behavior of quantum Griffiths singularity in two-dimensional superconductors
论文作者
论文摘要
量子格里菲斯的奇异性的特征在于动态临界指数与激活的缩放定律的差异，并且在各种二维超导体中已广泛观察到。最近，已经提出了与无关校正的直接激活缩放分析，并成功地用于分析Crystalline PDTE2和PolyCrystalline \ b {eta} -W膜的实验数据，该膜提供了量子Griffiths奇异性的新证据。在这里，我们表明直接激活的缩放分析适用于不同超导膜中的实验数据，包括三层GA膜和LAALO3/SRTIO3界面超导体。考虑到无关紧要的校正时，我们计算超高温度下的校正板电阻。在相对较大的温度状态和相边界的理论拟合中，校正阻力的缩放行为给出了量子格里菲斯奇异性的明确证据。与基于有限尺寸缩放的先前方法相比，直接激活的缩放分析代表了一种更直接，更精确的方法，用于分析不同二维超导体中量子格里菲斯奇异性的实验数据。
Quantum Griffiths singularity is characterized by the divergence of the dynamical critical exponent with the activated scaling law and has been widely observed in various two-dimensional superconductors. Recently, the direct activated scaling analysis with the irrelevant correction has been proposed and successfully used to analyze the experimental data of crystalline PdTe2 and polycrystalline \b{eta}-W films, which provides new evidence of quantum Griffiths singularity. Here we show that the direct activated scaling analysis is applicable to the experimental data in different superconducting films, including tri-layer Ga films and LaAlO3/SrTiO3 interface superconductor. When taking the irrelevant correction into account, we calculate the corrected sheet resistance at ultralow temperatures. The scaling behavior of the corrected resistance in a comparably large temperature regime and the theoretical fitting of the phase boundary give unambiguous evidence of quantum Griffiths singularity. Compared to the previous method based on the finite size scaling, the direct activated scaling analysis represents a more direct and precise way to analyze the experimental data of quantum Griffiths singularity in diverse two-dimensional superconductors.
