Critical behavior of quasi-two-dimensional ferromagnet Cr1.04Te2

doi:10.1088/1674-1056/ad4cd8

Abstract The self-intercalation of Cr into pristine two-dimensional (2D) van der Waals ferromagnetic CrTe$_{2}$, which forms chromium tellurides (Cr$_{x}$Te$_{2}$), has garnered interest due to their remarkable magnetic characteristics and the wide variety of chemical compositions available. Here, comprehensive basic characterization and magnetic studies are conducted on quasi-2D ferromagnetic Cr$_{1.04}$Te$_{2}$ crystals. Measurements of the isothermal magnetization curves are conducted around the critical temperature to systematically investigate the critical behavior. Specifically, the critical exponents $\beta = 0.2399$, $\gamma = 0.859$, and $\delta = 4.3498$, as well as the Curie temperature $T_{\rm C} = 249.56$,K, are determined using various methods, including the modified Arrott plots, the Kouvel-Fisher method, the Widom scaling method, and the critical isotherm analysis. These results indicate that the tricritical mean-field model accurately represents the critical behavior of Cr$_{1.04}$Te$_{2}$. A magnetic phase diagram with tricritical phenomenon is thus constructed. Further investigations confirm that the critical exponents obtained conform to the scalar equation near $T_{\rm C}$, indicating their self-consistency and reliability. Our work sheds light on the magnetic properties of quasi-2D Cr$_{1.04}$Te$_{2}$, broadening the scope of the van der Waals crystals for developments of future spintronic devices operable at room temperature.

Keywords: critical behavior van der Waals magnets self-intercalation magnetic measurement

Received: 17 March 2024
Revised: 15 May 2024
Accepted manuscript online: 17 May 2024

PACS:	75.30.-m	(Intrinsic properties of magnetically ordered materials)
	75.40.Cx	(Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
	77.80.B-	(Phase transitions and Curie point)

Fund: Project supported by the Natural Science Foundation of Nanjing University of Posts and Telecommunications (Grant No. NY222170), Jiangsu Specially-Appointed Professor Program, and Natural Science Foundation of Universities of Jiangsu Province (Grant No. TJ219008).

Corresponding Authors: Wei Niu, Xiao-Qian Zhang, Yong Pu
E-mail: weiniu@njupt.edu.cn;xiaoqianqian_zhang@163.com;puyong@njupt.edu.cn

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Wei Niu(钮伟), Qin-Xin Song(宋沁心), Shi-Qi Chang(常世琦), Min Wang(王敏), Kui Yuan(袁奎), Jia-Cheng Gao(高嘉程), Shuo Wang(王硕), Zhen-Dong Wang(王振东), Kai-Fei Liu(刘凯斐), Ping Liu(刘萍), Yong-Bing Xu(徐永兵), Xiao-Qian Zhang(张晓倩), and Yong Pu(普勇) Critical behavior of quasi-two-dimensional ferromagnet Cr_1.04Te₂ 2024 Chin. Phys. B 33 077506

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Critical behavior of quasi-two-dimensional ferromagnet Cr1.04Te2

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Critical behavior of quasi-two-dimensional ferromagnet Cr_1.04Te₂