发表机构
Laboratoire de Physique des Solides, Université Paris-Saclay; Kotelnikov Institute of Radioengineering and Electronics of RAS; L.D. Landau Institute for Theoretical Physics; National University of Science and Technology “MISIS”; Institut Pprime, CNRS-Université de Poitiers-ENSMA; Synchrotron SOLEIL（巴黎萨克雷大学固体物理实验室; 俄罗斯科学院科捷利尼科夫无线电工程与电子研究所; 列夫·朗道理论物理研究所; 莫斯科国立钢铁合金大学（MISIS）; 普里姆研究所; 索雷尔同步辐射中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过X射线衍射和输运测量，探究NbSe3在沿链轴及垂直方向拉伸应力下晶格结构与电荷密度波转变的演变，发现临界温度移动与晶格参数强相关，且两转变行为不同，归因于能带曲率改变。
AI 中文摘要
电荷密度波（CDW）态是结构态与电子态结合的一个典型例子，其特征既包括周期性晶格畸变，也包括由电子-声子耦合导致的凝聚电子的电子调制。因此，它们容易受到晶格应变的调控。NbSe3是CDW态的典型代表，具有链状结构，在145K和59K时表现出两个CDW，其波矢分别沿链轴b方向以及与链轴b成一定角度。在此，我们通过X射线衍射和输运测量的结合，报告了准一维电荷密度波系统NbSe3在沿链轴b方向及垂直于链轴b方向施加拉伸应力下，其晶格结构和CDW性质的演变。我们发现，晶格结构表现出奇异的泊松系数和强各向异性的杨氏模量，而电阻的演变则表明两个电荷密度波临界温度均发生移动，且这些移动与晶格参数密切相关。两个CDW转变在施加应力下表现出不同的行为，并表明能带曲率的改变导致了所观察到的输运特征。
英文摘要
The Charge Density Wave (CDW) state is a perfect example of a combined structural and electronic state, both characterized by a periodic lattice distortion and an electronic modulation of condensed electrons, resulting from electron-phonon coupling. They are thus prone to be tuned by lattice strain. NbSe3 is a prototypical example of CDW states, with a chain-like structure displaying two CDWs at 145K and 59K, with wavevectors along and inclined with respect to the chain axis b. Here, we report on the evolution of the lattice structure and CDW properties in the quasi-one-dimensional charge-density-wave system NbSe3 under tensile stresses applied along and perpendicular to the chains axis b by a combination of X-ray diffraction and transport measurements. We find that the lattice structure show exotic Poissons coefficients and strongly anisotropic Youngs moduli while the evolution of the electrical resistance demonstrates shifts of both charge-density-wave critical temperatures that are strongly correlated with the lattice parameters. The two CDW transitions display different behaviours under applied stresses, and suggest that a modification of the band curvature leads to the observed transport signatures.
Comments9 pages, 10 figures
