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arXiv 1801.10089cond-mat.str-el
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压力作用下FePS $_3$的结构和电子相变

Structural and electronic phase transitions in FePS$_3$ under the application of pressure

C. R. S. Haines, M. J. Coak, G. I. Lampronti, C. Liu, H. Hamidov, A. R. Wildes, D. Daisenberger, P. Nahai-Williamson, S. S. Saxena

摘要:

二维材料已被证明是新的和未研究的磁性形式和不寻常的金属状态的多产滋生地,特别是当它们在绝缘相和金属相之间调谐时。本文介绍了一种新的金属-绝缘体过渡体系FePS $_3$的工作。该化合物是一种二维范德华反铁磁莫特绝缘体。在这里,我们报告的发现FePS $_3$中的绝缘体-金属过渡,证明了X射线衍射和电输运测量,使用高压作为调谐参数。两个结构的相变中观察到的X-射线衍射数据作为一个函数的压力和电阻率的测量显示在高压下的金属状态的发病的证据。我们提出了两个新的结构,可以成功地解释X射线衍射图案的模型。

英文摘要:

Two-dimensional materials have proven to be a prolific breeding ground of new and unstudied forms of magnetism and unusual metallic states, particularly when tuned between their insulating and metallic phases. In this paper we present work on a new metal to insulator transition system FePS$_3$ . This compound is a two-dimensional van-der-Waals antiferromagnetic Mott insulator. Here we report the discovery of an insulator-metal transition in FePS$_3$, as evidenced by x-ray diffraction and electrical transport measurements, using high pressure as a tuning parameter. Two structural phase transitions are observed in the x-ray diffraction data as a function of pressure and resistivity measurements show evidence of onset of a metallic state at high pressures. We propose models for the two new structures that can successfully explain the x-ray diffraction patterns.

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