期刊
SCIENCE
卷 374, 期 6567, 页码 616-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abd5146
关键词
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资金
- German Federal Ministry for Education and Research [BMBF 05K10PC2, 05K10WR1, 05K10KE1]
- HZB
- AEI/FEDER, UE [FIS2016-78591-C3-2-R]
- FlagEra Sograph MEM [PCI2019-111908-2]
- National Natural Science Foundation of China [12074038]
Researchers have recently built a nearly ideal easy-plane system and observed robust ferromagnetic ordering on a single CrCl3 monolayer on graphene/6H-SiC(0001), exhibiting critical scaling characteristic of a 2D-XY system. This realization of a finite-size Berezinskii-Kosterlitz-Thouless phase transition in a large-area, quasi-free-standing van der Waals monolayer magnet with an XY universality class offers a material platform for 2D superfluid spin transport and topological magnetic textures.
The physics and universality scaling of phase transitions in low-dimensional systems has historically been a topic of great interest. Recently, two-dimensional (2D) materials exhibiting intriguing long-range magnetic order have been in the spotlight. Although an out-of-plane anisotropy has been shown to stabilize 2D magnetic order, the demonstration of a 2D magnet with in-plane rotational symmetry has remained elusive. We constructed a nearly ideal easy-plane system, a single CrCl3 monolayer on graphene/6H-SiC(0001), and observed robust ferromagnetic ordering with critical scaling characteristic of a 2D-XY system. These observations indicate the realization of a finite-size Berezinskii-Kosterlitz-Thouless phase transition in a large-area, quasi-free-standing van der Waals monolayer magnet with an XY universality class. This offers a material platform to host 2D superfluid spin transport and topological magnetic textures.
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