Magnetic properties and critical behavior of quasi-2D layered Cr₄Te₅ thin film

Abstract

Quasi-2D layered Cr₄Te₅ thin film has attracted great attention because it possesses the high Curie temperature close to room temperature and relatively large saturation magnetization. However, the magnetic interactions and the nature of magnetic phase transition in the Cr₄Te₅ film have not been explored thoroughly. In this paper, we focused on the critical behavior of its magnetic phase transition through the epitaxial Cr₄Te₅ film fabricated by pulsed laser deposition (PLD). The final critical exponents β = 0.359(2) and γ = 1.54(2) were obtained by linear extrapolation together with Arrott-Noakes equation of state, and their accuracy was confirmed by using the Widom scaling relation and scaling hypothesis. We find that some magnetic disorders exist in the Cr₄Te₅ film system, which is related to Cr₄Te₅ critical behavior why its critical behavior is quite far from any conventional universality class. Furthermore, we also determined that the Cr₄Te₅ film exhibits a quasi-2D long-range magnetic interaction. Finally, the itinerant ferromagnets of Cr₄Te₅ films were confirmed by the Takahashi’s self-consistent renormalization theory of spin fluctuations. Our work provides a new idea for understanding the mechanism of magnetic interactions in similar 2D layered films.

Graphical abstract

References

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Electronic supplementary material

Supplementary materials are available in the online version of this article at https://doi.org/10.1007/s11467-022-1210-1 and https://journal.hep.com.cn/fop/EN/10.1007/s11467-022-1210-1 and are accessible for authorized users.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11974181, 12074386, and 11874358), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21_0177), the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP), and the Hongque Innovation Center (No. HQ202102003).

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