关于“过渡金属氮氧化物中由本征阴离子无序引起的电子局域化”一文的错误样品分类
Incorrect sample classification in "Electron localization induced by intrinsic anion disorder in a transition metal oxynitride"
AI总结：
本文评论指出Daichi Oka等人对SrNbO$_{3-x}$N$_x$的MIT研究错误使用了Al'tshuler-Aronov理论，从三个角度重新分析证明被分类为金属的$x=0.96$样品实为激活型导电，从而质疑了局域化标度理论中MIT的连续性。
摘要：
在Daichi Oka等人[Commun. Phys. 4, 269 (2021)]近期对无序晶体固体SrNbO$_{3-x}$N$_x$的金属-绝缘体相变（MIT）研究中，其数据评估依赖于电子-电子相互作用与电子弹性杂质散射干涉的Al'tshuler-Aronov理论。本评论表明该评估方法是不恰当的。为此，我们从三个不同角度重新考虑了$x = 0.96$和$x = 1.02$样品的数据：(i) 分析电导率的对数温度导数，(ii) 研究测量电导率数据与温度依赖性的Al'tshuler-Aronov近似之间的偏差，以及(iii) 将测量的温度数据与使用该近似将样品视为次级温度计所获得的值进行比较。通过这种方式，对于被Daichi Oka等人分类为金属的$x = 0.96$样品，揭示了测量结果与根据Al'tshuler-Aronov理论进行的零温外推之间的定性矛盾。因此，该样品极有可能表现出激活型导电而非金属导电。结果，我们的发现对源自高被引局域化标度理论的MIT连续性提出了质疑。
英文摘要：
In the recent study of the metal-insulator transition (MIT) in the disordered crystalline solid SrNbO$_{3-x}$N$_x$ by Daichi Oka et al. [Commun. Phys. 4, 269 (2021)], the data evaluation relies on the Al'tshuler-Aronov theory of the interference of electron-electron interaction and elastic impurity scattering of electrons. The present comment shows that this evaluation approach is inappropriate. For that aim, we reconsider data for the samples with $x = 0.96$ and $x = 1.02$ from three different perspectives: (i) analysis of the logarithmic temperature derivative of the conductivity, (ii) study of the deviations of the measured conductivity data from the Al'tshuler-Aronov approximation of the temperature dependence, and (iii) comparison of the measured temperature data with the values obtained treating the sample as secondary thermometer in terms of that approximation. This way, for the sample with $x = 0.96$, classified as metallic by Daichi Oka et al., qualitative contradictions between the measurements and the zero-temperature extrapolation according to the Al'tshuler-Aronov theory are uncovered. Thus, this sample very likely exhibits activated instead of metallic conduction. In consequence, our findings question the continuity of the MIT resulting from the highly cited scaling theory of localization.
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