Unconventional magneto-transport properties of Cr₃Te₄ and their gate modulation

Layered transition-metal dichalcogenides (TMDCs) have attracted a lot of attention due to their unique 2D properties that could emerge by reducing the layer number down to the monolayer limit. Among different TMDCs, Cr_1+xTe₂ is of great importance as one of room-temperature vdW ferromagnets. Moreover, recent studies have unveiled the intriguing magneto-transport properties of this material system potentially associated with a semimetallic band as verified by the angle-resolved photoemission spectroscopy measurements [1].

Recently, we have succeeded in fabricating high-quality Cr₃Te₄ epitaxial thin films by molecular-beam epitaxy [2], and revealed the impacts of vacuum annealing [2] and Li intercalation [3] on their magnetic properties. In this study, we conducted the Li intercalation to the annealed Cr₃Te₄ epitaxial thin films, which are known to possess unique magnetic properties that are different from the as-grown films [2]. We will in particular focus on the gating effects on the magneto-transport properties, which turned out to be unusual that have not been observed in the previous gating experiments on a simple ferromagnet.

[1] Y. Fujisawa, et al., Adv. Mater. 35, 2207121 (2023).

[2] Y. Wang, et al., Nano Lett. 22, 9964-9971 (2022).

[3] H. Matsuoka, et al., Sci. Adv. 10, eadk1415 (2024).