来自散装 (RO)nPb 的二维 Pb 方网（R = 稀土金属，n = 1,2）,Journal of the American Chemical Society

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来自散装 (RO)nPb 的二维 Pb 方网（R = 稀土金属，n = 1,2）
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-07-31 , DOI: 10.1021/jacs.3c05807
Xu Chen ₁ , Jun Deng ₁ , Shifeng Jin ₁ , Tianping Ying ₁ , Ge Fei ₂ , Huifen Ren ₁ , Yunfan Yang _{1,

3} , Ke Ma _{1,

3} , Mingzhang Yang _{1,

3} , Junjie Wang _{1,

3} , Yanchun Li ₄ , Xin Chen ₂ , Xiaobing Liu ₂ , Shixuan Du ₁ , Jian-Gang Guo _{1,

5} , Xiaolong Chen _{1,

3,

5}

Affiliation

从 Si 到 Pb 的所有 IV 族元素二维 (2D) 材料均通过载流子掺杂和基底的界面键合来稳定，石墨烯除外，石墨烯可以是独立的。强杂化键的参与、外来原子种类的吸附以及高浓度的晶体缺陷通常是不可避免的，这使得固有性质的测量变得复杂。在这项工作中，我们报告了七种迄今为止未报道的块状化合物（ R O）_n Pb（R =稀土金属，n = 1,2）的发现，它们由空间和电子上的准二维Pb方网组成。与[ RO ] ^δ+阻挡层分离。这些化合物在费米能级附近的能带结构相对干净，主要由 Pb 贡献，类似于电子掺杂的独立 Pb 单层。R ₂ O ₂ Pb化合物在环境压力下是金属性的，并且在高压下成为具有增强的临界场的超导体。特别是，Gd ₂ O ₂ Pb (9.1 μB _/ Gd) 在 10 GPa 的临界压力下表现出有趣的晶格畸变体响应以及超导性和磁异常的出现。我们的研究结果揭示了二维铅片的意想不到的方面，它们与散装材料有很大不同，并为探索散装材料的二维特性提供了另一种途径。

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Two-Dimensional Pb Square Nets from Bulk (RO)nPb (R = Rare Earth Metals, n = 1,2)

All two-dimensional (2D) materials of group IV elements from Si to Pb are stabilized by carrier doping and interface bonding from substrates except graphene which can be free-standing. The involvement of strong hybrid of bonds, adsorption of exotic atomic species, and the high concentration of crystalline defects are often unavoidable, complicating the measurement of the intrinsic properties. In this work, we report the discovery of seven kinds of hitherto unreported bulk compounds (RO)_nPb (R = rare earth metals, n = 1,2), which consist of quasi-2D Pb square nets that are spatially and electronically detached from the [RO]^δ+ blocking layers. The band structures of these compounds near Fermi levels are relatively clean and dominantly contributed by Pb, resembling the electron-doped free-standing Pb monolayer. The R₂O₂Pb compounds are metallic at ambient pressure and become superconductors under high pressures with much enhanced critical fields. In particular, Gd₂O₂Pb (9.1 μ_B/Gd) exhibits an interesting bulk response of lattice distortion in conjunction with the emergence of superconductivity and magnetic anomalies at a critical pressure of 10 GPa. Our findings reveal the unexpected facets of 2D Pb sheets that are considerably different from their bulk counterparts and provide an alternative route for exploring 2D properties in bulk materials.

更新日期：2023-07-31

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