Scholarlink

<p>Fe<sub>5-x</sub>GeTe<sub>2</sub> is a magnetic van der Waals material with a relatively high Curie temperature near room temperature. Fe<sub>5-x</sub>GeTe<sub>2</sub> exhibits unique magnetic properties due to its chemical and structural complexities. In this study, we employed scanning tunneling microscopy (STM) to investigate the thermal fluctuation of Fe-Ge ordering in Fe<sub>5-x</sub>GeTe<sub>2</sub>. At low temperatures (79&#xa0;K), the Fe<sub>5-x</sub>GeTe<sub>2</sub> surface exhibits distinct order with √3 × √3 periodicity resulting from the ordered Fe(1) atoms located in the outermost Fe<sub>5</sub>Ge sublayer, while Fe deficient area shows 1 × 1 hexagonal lattice. At room temperature, on the other hand, structural fluctuations occur as thermal energy drives Fe(1) atom diffusion via a vacancy-mediated process. This results in the temporal rearrangement of the √3 × √3 and 1 × 1 regions at their boundaries. These findings provide important insights into the structural and magnetic properties of Fe<sub>5-x</sub>GeTe<sub>2</sub>.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Thermal fluctuation of Fe-Ge ordering in Fe5-xGeTe2 single crystals

  • 期刊论文

  • 发表日期：

    2025年4月4日

查看全文
  • Nguyen Huu Lam,
  • Trinh Thi Ly,
  • Nguyen-Hoang Dang,
  • Ganbat Duvjir,
  • Hyo-Bin Ahn,
  • Changgu Lee,
  • Jungdae Kim

摘要

Fe5-xGeTe2 is a magnetic van der Waals material with a relatively high Curie temperature near room temperature. Fe5-xGeTe2 exhibits unique magnetic properties due to its chemical and structural complexities. In this study, we employed scanning tunneling microscopy (STM) to investigate the thermal fluctuation of Fe-Ge ordering in Fe5-xGeTe2. At low temperatures (79 K), the Fe5-xGeTe2 surface exhibits distinct order with √3 × √3 periodicity resulting from the ordered Fe(1) atoms located in the outermost Fe5Ge sublayer, while Fe deficient area shows 1 × 1 hexagonal lattice. At room temperature, on the other hand, structural fluctuations occur as thermal energy drives Fe(1) atom diffusion via a vacancy-mediated process. This results in the temporal rearrangement of the √3 × √3 and 1 × 1 regions at their boundaries. These findings provide important insights into the structural and magnetic properties of Fe5-xGeTe2.