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arXiv 2102.11933cond-mat.supr-concond-mat.mtrl-sci
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NbS $_2$体系的多型性与超导电性

Polytypism and Superconductivity in the NbS$_2$ System

Catherine Witteveen, Karolina Gornicka, Johan Chang, Martin Månsson, Tomasz Klimczuk, Fabian O. von Rohr

摘要:

本文报道了NbS $_2$体系的相形成和超导性质。具体来说,我们已经进行了一系列的标准化的固态合成在这个系统中,这使我们能够建立一个全面的合成图形成的两个多型2H-NbS $_2$和3R-NbS $_2$,分别。我们表明,通过X-射线衍射的两个多型体的识别并不总是明确的。我们对纯相的3R-NbS $_2$样品、纯相的2H-NbS $_2$样品和混合相样品的物理性质测量证实了早先的报道:2H-NbS $_2$是块体超导体,而3R-NbS $_2$在$T =$ 1.75 K以上不是超导体。我们的研究结果清楚地表明,比热测量,作为真正的散装测量,是至关重要的超导材料在这个和相关系统的识别。我们的研究结果表明,对于范德瓦尔斯材料的研究,必须非常小心地选择合成条件,以获得相纯的样品。

英文摘要:

We report on the phase formation and the superconducting properties in the NbS$_2$ system. Specifically, we have performed a series of standardized solid-state syntheses in this system, which allow us to establish a comprehensive synthesis map for the formation of the two polytypes 2H-NbS$_2$ and 3R-NbS$_2$, respectively. We show that the identification of two polytypes by means of X-ray diffraction is not always unambiguous. Our physical property measurements on a phase-pure sample of 3R-NbS$_2$, on a phase-pure sample of 2H-NbS$_2$, and a mixed phase sample confirm earlier reports that 2H-NbS$_2$ is a bulk superconductor and that 3R-NbS$_2$ is not a superconductor above $T =$ 1.75 K. Our results clearly show that specific heat measurements, as true bulk measurements, are crucial for the identification of superconducting materials in this and related systems. Our results indicate that for the investigation of van-der-Waals materials great care has to be taken on choosing the synthesis conditions for obtaining phase pure samples.

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