| Autor: |
Pasco, Christopher M., Baggari, Ismail El, Bianco, Elisabeth, Kourkoutis, Lena F., McQueen, Tyrel M. |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
ACS Nano 2019 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1021/acsnano.9b04392 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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