2020/03/15 by Zhengxian Li, Wei Xia, Hao Su +7 · 86 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Condensed matter physics #Critical exponent #Curie temperature #Exchange interaction #Ferromagnetism #Graphene research and applications #Magnetic field #Magnetization #Materials science #Molecule #Phase transition #Physics #Quantum mechanics #Topological Materials and Phenomena #cond-mat.str-el #van der Waals force
paper · pdf · doi:10.1038/s41598-020-72203-3
published in Scientific Reports 10(1), 15345 (Nature Portfolio) · 22 pages, 2 tables, 6 figures
arxiv created 2020/03/15 · openalex publication_date 2020/09/18 · arxiv updated 2021/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract The van der Waals ferromagnet Fe 5 GeTe 2 has a Curie temperature T C of about 270 K, which is tunable through controlling the Fe deficiency content and can even reach above room temperature. To achieve insights into its ferromagnetic exchange that gives the high T C , the critical behavior has been investigated by measuring the magnetization in Fe 5 GeTe 2 crystal around the ferromagnetic ordering temperature. The analysis of the measured magnetization by using various techniques harmonically reached to a set of reliable critical exponents with T C = 273.7 K, β = 0.3457 ± 0.001, γ = 1.40617 ± 0.003, and δ = 5.021 ± 0.001. By comparing these critical exponents with those predicted by various models, it seems that the magnetic properties of Fe 5 GeTe 2 could be interpreted by a three-dimensional magnetic exchange with the exchange distance decaying as J ( r ) ≈ r −4.916 , close to that of a three-dimensional Heisenberg model with long-range magnetic coupling.