Discovery of spontaneous mesoscopic strain waves in nematic domains using dark-field X-ray microscopy
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Electronic nematic order arises when correlated electrons spontaneously break the rotational symmetry of a crystal lattice. When electronic nematic order couples bilinearly to symmetry-breaking lattice strain, both appear together at a single ferroelastic phase transition, producing structural twin domains with distinct orientations of the nematic director. While the effects of applied strain on these domains are well established, the intrinsic behavior of spontaneous subdomain strain fields has remained unexplored. Here, we report the discovery of spontaneous mesoscopic strain waves within individual nematic domains of an iron-based superconductor, observed using dark-field X-ray microscopy (DFXM). Using this novel full-field imaging technique, we visualize subdomain strain modulations emerging concurrently with nematic order. Elastic compatibility relations governing inhomogeneous strains provide a natural mechanism for the strain waves. Our findings reveal a broadly relevant form of ..., , , # Data from: Discovery of spontaneous mesoscopic strain waves in nematic domains using dark-field X-ray microscopy **File name:** StrainWavesManuscript_data.zip **Created by:** Kaan Alp Yay, Stanford University **Email:** [kaanalpyay@stanford.edu](mailto:kaanalpyay@stanford.edu) **Creation date:** 15-Sep-25 **Last edited:** 08-Apr-26 ## Description This repository contains data files corresponding to each figure in the manuscript that includes experimental data. * **Microscopy images** are provided in `.npz` (NumPy container), `.h5` (HDF5), and `.tiff` formats to ensure compatibility with different programming languages. * **Line plot data** (Fig. 3b â lower panel) is provided in `.csv` and `.npz` formats. ### Image details * For microscopy images (Figures **2b, 3a, 3b upper panel, 3c, 4a, 4b**): * Each pixel corresponds to **50 nm à 50 nm**. (nm = nanometers) * **NaN values** in strain and orientation maps represent regions with insufficient X-ray intensity. * For Fourier tra...,
电子向列序（electronic nematic order）指关联电子自发破缺晶格旋转对称性时形成的有序态。当电子向列序与破对称晶格应变发生双线性耦合时，二者将在单次铁弹性相变中共同出现，进而形成具有不同向列矢（nematic director）取向的结构孪晶畴。尽管外加应变对这类畴的影响已被充分阐明，但自发亚畴应变场的本征行为仍未得到探索。本文报道了利用暗场X射线显微镜（dark-field X-ray microscopy, DFXM）在铁基超导体的单个向列畴中观测到自发介观应变波的研究发现。借助这一新型全场成像技术，我们可视化了与向列序同步涌现的亚畴应变调制现象。控制非均匀应变的弹性相容性关系为该应变波提供了自然的物理机制。本研究揭示了一类具有广泛普适性的…… # 数据来源：《利用暗场X射线显微镜在向列畴中发现自发介观应变波》（Discovery of spontaneous mesoscopic strain waves in nematic domains using dark-field X-ray microscopy） **文件名**：StrainWavesManuscript_data.zip **创建者**：Kaan Alp Yay，斯坦福大学 **邮箱**：[kaanalpyay@stanford.edu](mailto:kaanalpyay@stanford.edu) **创建日期**：2025年9月15日 **最后修改日期**：2026年4月8日 ## 数据集说明 本仓库包含与手稿中所有搭载实验数据的图表相对应的数据文件。 * **显微成像数据**：提供了`.npz`（NumPy容器格式）、`.h5`（HDF5格式）及`.tiff`格式的文件，以兼容不同编程语言环境。 * **折线图数据**（对应图3b下子图）：以`.csv`和`.npz`格式提供。 ### 图像细节 * 针对显微成像图像（对应图2b、3a、3b上子图、3c、4a、4b）： * 每个像素对应**50 nm × 50 nm**（nm即纳米）。 * 应变与取向分布图中的**NaN（非数值）值**代表X射线强度不足的区域。 * 针对傅里叶变换……
