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Absence of ferromagnetism in MnBi$$_2$$Te$$_4$$/Bi$$_2$$Te$$_3$$ down to 6 K

深澤 拓朗*; 日下 翔太郎*; 角田 一樹; 橋爪 瑞葵*; 一ノ倉 聖*; 竹田 幸治; 出田 真一郎*; 田中 清尚*; 清水 亮太*; 一杉 太郎*; 平原 徹*

Fukasawa, Takuro*; Kusaka, Shotaro*; Sumida, Kazuki; Hashizume, Mizuki*; Ichinokura, Satoru*; Takeda, Yukiharu; Ideta, Shinichiro*; Tanaka, Kiyohisa*; Shimizu, Ryota*; Hitosugi, Taro*; Hirahara, Toru*

We successfully fabricated a MnBi$$_2$$Te$$_4$$/Bi$$_2$$Te$$_3$$ heterostructure by incorporating Mn and Te inside the topmost quintuple layer of Bi$$_2$$Te$$_3$$, as unambiguously confirmed by LEED I-V scanning transmission electron microscopy measurements. The surface-state Dirac cone of the heterostructure showed little change compared to that of the pristine Bi$$_2$$Te$$_3$$ and X-ray magnetic circular dichroism measurements showed that the system was paramagnetic down to 5.6 K. These results are in contrast to the previous works on related materials that showed magnetic order around 10 K as well as theoretical predictions and suggests the intricacy of the magnetic properties of two-dimensional van der Waals magnets.

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