近藤绝缘体SmB6中的金属岛

J. Souza, P. Rosa, J. Sichelschmidt, M. Carlone, P. Venegas, M. O. Malcolms, P. Menegasso, R. Urbano, Z. Fisk, P. G. P. I. D. F. Wataghin, Unicamp, M. Solids, Los Alamos National Laboratory, D. D. F'isica, F. Ciencias, Unesp, Posmat, D. Physics, Astronomy, U. California
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引用次数: 6

摘要

SmB $_{6}$中预测的Kondo物理和非平凡拓扑之间的相互作用刺激了许多实验报告,其中一些是明显矛盾的。争论的起因可能是在存在Sm空位(近藤孔)和/或天然杂质(如Gd $^{3+}$)时,近藤绝缘相的脆弱性。在这项工作中,我们通过结合电子自旋共振(ESR)和互补体测量,局部研究了Al-flux生长的Sm $_{1-x}$ Gd $_{x}$ B $_{6}$单晶(0 $\leq$$x$$\leq$ 0.02)的这种脆弱性。Gd在高稀态($x$$\sim 0.0004$)下的$^{3+}$ ESR谱显示出绝缘立方环境的特征。值得注意的是,在更浓的样品($x$$\geq$ 0.004)中观察到金属ESR线形状,即使这些系统仍然处于合理的稀释状态并显示绝缘$dc$电阻率。我们的数据表明,在整体渗透发生之前,在杂质周围局部破坏了近藤绝缘状态。这一结果不仅解释了$dc$和$ac$电导率之间的差异,而且还提供了一个场景来解释在没有电阻率量子振荡的情况下磁化中量子振荡的存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Metallic islands in the Kondo insulator SmB6
The predicted interplay between Kondo physics and non-trivial topology in SmB$_{6}$ has stimulated many experimental reports, some of which are in apparent contradiction. The origin of the dispute may lie on the fragility of the Kondo insulating phase in the presence of Sm vacancies (Kondo holes) and/or natural impurities, such as Gd$^{3+}$. In this work, we locally investigated this fragility for Al-flux grown Sm$_{1-x}$Gd$_{x}$B$_{6}$ single crystals (0 $\leq$ $x$ $\leq$ 0.02) by combining electron spin resonance (ESR) and complementary bulk measurements. The Gd$^{3+}$ ESR spectra in a highly dilute regime ($x$ $\sim 0.0004$) display the features of an insulating cubic environment. Remarkably, a metallic ESR lineshape is observed for more concentrated samples ($x$ $\geq$ 0.004), even though these systems are still in a reasonably dilute regime and show insulating $dc$ electrical resistivity. Our data indicate that the Kondo insulating state is destroyed locally around impurities before a global percolation occurs. This result not only explains the discrepancy between $dc$ and $ac$ conductivity, but also provides a scenario to explain the presence of quantum oscillations in magnetization in the absence of quantum oscillations in electrical resistivity.
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