磁性
范德瓦尔斯力
凝聚态物理
顺磁性
单重态
堆积
基态
相变
磁铁
材料科学
物理
原子物理学
核磁共振
分子
量子力学
激发态
作者
Chris Pasco,Ismail El Baggari,Elisabeth Bianco,Lena F. Kourkoutis,Tyrel M. McQueen
出处
期刊:ACS Nano
[American Chemical Society]
日期:2019-07-16
卷期号:13 (8): 9457-9463
被引量:32
标识
DOI:10.1021/acsnano.9b04392
摘要
Incorporating magnetism into two dimensional (2D) van der Waals (VdW) heterostrutures is crucial for the development of functional electronic and magnetic devices. Here we show that Nb3X8 (X = Cl, Br) is a family of 2D layered trimerized kagom\'e magnets that are paramagnetic at high temperatures and undergo a first order phase transition on cooling to a singlet magnetic state. X-ray diffraction shows that a rearrangement of the VdW stacking accompanies the magnetic transition, with high and low temperature phases consistent with STEM images of the end members {\alpha}-Nb3Cl8 and \b{eta}-Nb3Br8. The temperature of this transition is systematically varied across the solid solution Nb3Cl8-xBrx (x = 0-8), with x = 6 having transitions near room temperature. The solid solution also varies the optical properties, which are further modulated by the phase transition. As such, they provide a platform on which to understand and exploit the interplay between dimensionality, magnetism, and optoelectronic behavior in VdW materials.
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