Two-dimensional (2D) magnets have attracted significant attention in recent years due to their importance in the research on both fundamental physics and spintronic applications. Here, we report the discovery of a new ternary compound FePd₂Te₂. It features a layered quasi-2D crystal structure with 1D Fe zigzag chains extending along the b-axis in the cleavage plane. Single crystals of FePd₂Te₂ with centimeter size could be grown. Density functional theory calculations, mechanical exfoliation, and atomic force microscopy on these crystals reveal that they are 2D materials that can be thinned down to ∼5 nm. Magnetic characterization shows that FePd₂Te₂ is an easy-plane ferromagnet with T_C ∼ 183 K and strong in-plane uniaxial magnetic anisotropy. Magnetoresistance and the anomalous Hall effect demonstrate that ferromagnetism could be maintained in FePd₂Te₂ flakes with large coercivity. A crystal twinning effect is observed by scanning tunneling microscopy which makes the Fe chains right angle bent in the cleavage plane and creates an intriguing spin texture. Besides, a large electronic specific heat coefficient of up to γ ∼ 32.4 mJ mol^–1 K^–2 suggests FePd₂Te₂ is a strongly correlated metal. Our results show that FePd₂Te₂ is a correlated anisotropic 2D magnet that may attract multidisciplinary research interests.

中文翻译：

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FePd2Te2：具有一维 Fe 链的各向异性二维铁磁体


近年来，二维（2D）磁体因其在基础物理和自旋电子学应用研究中的重要性而引起了人们的广泛关注。在这里，我们报告了一种新的三元化合物 FePd ₂ Te ₂ 的发现。它具有层状准二维晶体结构，具有沿解理面中的 b 轴延伸的 1D Fe 锯齿状链。可以生长出厘米尺寸的FePd ₂ Te ₂ 单晶。对这些晶体的密度泛函理论计算、机械剥离和原子力显微镜表明，它们是可以减薄至~5 nm 的二维材料。磁表征表明，FePd ₂ Te ₂ 是一种易面铁磁体，T _C ∼ 183 K，具有较强的面内单轴磁各向异性。磁阻和反常霍尔效应表明，具有大矫顽力的FePd ₂ Te ₂ 片可以保持铁磁性。通过扫描隧道显微镜观察到晶体孪生效应，该效应使 Fe 链在解理平面上呈直角弯曲，并产生有趣的自旋纹理。此外，高达 γ ∼ 32.4 mJ mol ^–1 K ^–2 的大电子比热系数表明 FePd ₂ Te ₂ 是一种强关联金属。我们的结果表明，FePd ₂ Te ₂ 是一种相关各向异性二维磁体，可能会吸引多学科的研究兴趣。