Wang Aifeng, Wu Lijun, Du Qianheng, Naamneh Muntaser, Brito Walber Hugo, Abeykoon Am Milinda, Pudelko Wojciech Radoslaw, Jandke Jasmin, Liu Yu, Plumb Nicholas C, Kotliar Gabriel, Dobrosavljevic Vladimir, Radovic Milan, Zhu Yimei, Petrovic Cedomir
Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States.
Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11790, United States.
Nano Lett. 2022 Sep 14;22(17):6900-6906. doi: 10.1021/acs.nanolett.2c01282. Epub 2022 Aug 17.
Nanoscale inhomogeneity can profoundly impact properties of two-dimensional van der Waals materials. Here, we reveal how sulfur substitution on the selenium atomic sites in FeSeS (0 ≤ ≤ 1, ≤ 0.1) causes Fe-Ch (Ch = Se, S) bond length differences and strong disorder for 0.4 ≤ ≤ 0.8. There, the superconducting transition temperature is suppressed and disorder-related scattering is enhanced. The high-temperature metallic resistivity in the presence of strong disorder exceeds the Mott limit and provides an example of the violation of Matthiessen's rule and the Mooij law, a dominant effect when adding moderate disorder past the Drude/Matthiessen's regime in all materials. The scattering mechanism responsible for the resistivity above the Mott limit is unrelated to phonons and arises for strong Se/S atom disorder in the tetrahedral surrounding of Fe. Our findings shed light on the intricate connection between the nanostructural details and the unconventional scattering mechanism, which is possibly related to charge-nematic or magnetic spin fluctuations.
纳米尺度的不均匀性会对二维范德华材料的性质产生深远影响。在此，我们揭示了在FeSeS（0≤≤1，≤0.1）中硒原子位点上的硫取代如何导致Fe-Ch（Ch = Se，S）键长差异以及在0.4≤≤0.8时出现强烈的无序。在那里，超导转变温度被抑制，与无序相关的散射增强。在强无序存在下的高温金属电阻率超过了莫特极限，并提供了一个违反马蒂森规则和穆伊定律的例子，这是在所有材料中超过德鲁德/马蒂森 regime 添加适度无序时的主导效应。导致高于莫特极限的电阻率的散射机制与声子无关，并且在Fe的四面体环境中由于强烈的Se/S原子无序而出现。我们的发现揭示了纳米结构细节与非常规散射机制之间的复杂联系，这可能与电荷向列或磁自旋涨落有关。
