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

doi:10.1088/1674-1056/ad4cd8

中国物理B ›› 2024, Vol. 33 ›› Issue (7): 77506-077506.doi: 10.1088/1674-1056/ad4cd8

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

Wei Niu(钮伟)^1,†, Qin-Xin Song(宋沁心)¹, Shi-Qi Chang(常世琦)¹, Min Wang(王敏)¹, Kui Yuan(袁奎)¹, Jia-Cheng Gao(高嘉程)¹, Shuo Wang(王硕)¹, Zhen-Dong Wang(王振东)¹, Kai-Fei Liu(刘凯斐)¹, Ping Liu(刘萍)¹, Yong-Bing Xu(徐永兵)^1,2, Xiao-Qian Zhang(张晓倩)^3,‡, and Yong Pu(普勇)^1,§

1 Jiangsu Provincial Engineering Research Center of Low Dimensional Physics and New Energy & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
2 School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China;
3 Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China

收稿日期:2024-03-17 修回日期:2024-05-15 接受日期:2024-05-17 出版日期:2024-06-18 发布日期:2024-06-28
通讯作者: Wei Niu, Xiao-Qian Zhang, Yong Pu E-mail:weiniu@njupt.edu.cn;xiaoqianqian_zhang@163.com;puyong@njupt.edu.cn
基金资助:
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).

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

1 Jiangsu Provincial Engineering Research Center of Low Dimensional Physics and New Energy & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
2 School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China;
3 Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China

Received:2024-03-17 Revised:2024-05-15 Accepted:2024-05-17 Online:2024-06-18 Published:2024-06-28
Contact: Wei Niu, Xiao-Qian Zhang, Yong Pu E-mail:weiniu@njupt.edu.cn;xiaoqianqian_zhang@163.com;puyong@njupt.edu.cn
Supported by:
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).

1. 2024-077506-SI.pdf(894KB)

摘要/Abstract

摘要： 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.

关键词: critical behavior, van der Waals magnets, self-intercalation, magnetic measurement

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.

Key words: critical behavior, van der Waals magnets, self-intercalation, magnetic measurement

中图分类号: (Intrinsic properties of magnetically ordered materials)

75.30.-m

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)

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[J]. 中国物理B, 2024, 33(7): 77506-077506.

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

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

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