Critical behavior in hexagonal Y2Fe17: magnetic interaction crossover from 3D to 2D Ising model

• Published in: CrystEngComm 2021-05, Vol.23 (18), p.3411-3418
• Main Authors: Fan, Jiyu, Huang, Can, Liu, Hao, Yu-E, Yang, Sánchez Llamazares, J L, Sánchez Valdés, C F, Gorria, Pedro, Ma, Chunlan, Zhu, Yan, Yang, Hao
• Format: Article
• Language: English
• Subjects: Crossovers; Crystal structure; Density functional theory; Ferromagnetism; First principles; Group theory; Ising model; Magnetic properties; Melt spinning; Phase transitions; Transition temperature; Two dimensional models
• ISSN: 1466-8033
• DOI: 10.1039/d1ce00156f

The critical behavior of single phase Y2Fe17 melt-spun ribbons with the Th2Fe17-type crystal structure has been studied around the transition temperature (TC). This alloy undergoes a second-order ferromagnetic (FM)–paramagnetic (PM) phase transition at TC = 301 K. Various techniques, such as the modified Arrott plot, Kouvel–Fisher method, and critical isotherm analysis, were used to determine the critical exponents that were found to be β = 0.226(3), γ = 1.296(2), and δ = 6.804(5). The universality class of the critical phenomenon in the Y2Fe17 ribbons can be explained with the help of the renormalization group theory approach, in which the magnetic properties show a feature changing from three (3D)- to two-dimensional (2D) Ising model. The first-principles calculations based on density functional theory qualitatively explain the experimental results, confirming the strong correlation between lattice atoms and critical behavior in magnetic intermetallic Y2Fe17.