Spatially correlated incommensurate lattice modulations in an atomically thin high-temperature Bi2.1Sr1.9CaCu2.0O8+y superconductor
Spatially correlated incommensurate lattice modulations in an atomically thin high-temperature Bi2.1Sr1.9CaCu2.0O8+y superconductor
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原子薄高温 Bi2.1Sr1.9CaCu2.0O8 y 超导体中空间相关的不相称晶格调制
DOI：
10.1103/physrevmaterials.4.114007
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发表时间：
2020
影响因子：
3.4
通讯作者：
Watanabe, Kenji
中科院分区：
文献类型：
--
作者：
Poccia, Nicola;Zhao, Shu Yang;Yoo, Hyobin;Huang, Xiaojing;Yan, Hanfei;Chu, Yong S.;Zhong, Ruidan;Gu, Genda;Mazzoli, Claudio;Watanabe, Kenji
我们报告了厚度低至两个晶胞的不相称晶格调制 (ILM) 范德华异质结构的高空间分辨率、低于 100 nm 的扫描纳米 X 射线衍射 (SnXRD) 成像。我们揭示了大块样品和表面的不同的长程和短程 ILM。我们发现 ILM 水坑状域的大小和相互方向由系统的维数决定。在两个晶胞样本中，长程和短程阶次的波矢变得反相关，并且出现的空间模式具有方向梯度。这些出现的图案意味着静态介观晶格调制。我们的研究结果为局部应变工程调节二维高温超导体的性能开辟了一条途径。
We report high spatial resolution, below 100 nm, scanning nano x-ray diffraction (SnXRD) imaging of incommensurate lattice modulations (ILM) invan der Waals heterostructures of thicknesses down to two unit cells. We reveal the distinct long-range and short-range ILMs in a bulk sample and at the surface. We find that the size and mutual orientation of the puddlelike domains of the ILM are determined by the dimensionality of the system. In the two-unit-cell sample, the wave vectors of the long- and short-range orders become anticorrelated, and the emergent spatial patterns have a directional gradient. These emergent patterns imply static mesoscopic lattice modulation. Our findings open a route for local strain engineering to modulate properties of two-dimensional high-temperature superconductors.