Pressure-Modulated Structural and Magnetic Phase Transitions in Two-Dimensional FeTe: Tetragonal and Hexagonal Polymorphs

• DOI: 10.1021/acs.nanolett.3c04384
• Publication Date: 2024-01-11T16:15:37Z
• Authors: Wuxiao Han; Jiajia Feng; Hongliang Dong; Mo Cheng; Liu Yang; Yunfei Yu; Guoshuai Du; Jiayin Li; Yubing Du; Tiansong Zhang; Zhiwei Wang; Bin Chen; Jianping Shi; Yabin Chen
• Keywords: Tetragonal crystal system; Hydrostatic pressure

Two-dimensional (2D) Fe chalcogenides with their rich structures and properties are highly desirable for revealing the torturous transition mechanism of exploring potential applications in spintronics nanoelectronics. Hydrostatic pressure can effectively stimulate phase transitions between various ordered states, allowing one to successfully plot a diagram given material. Herein, structural evolution transport characteristics 2D FeTe were systematically investigated under extreme conditions by comparing two distinct symmetries, i.e., tetragonal (t) hexagonal (h) FeTe. We found that t-FeTe presented pressure-induced from an antiferromagnetic state ferromagnetic at ∼3 GPa, corresponding collapse layered structure. Contrarily, order h-FeTe was retained up 15 which evidently confirmed electrical Raman measurements. Furthermore, T–P diagrams mapped delicate critical conditions. Our results provide unique platform elaborate extraordinary further develop applications.