论文标题
电荷密度波动力学的纳米级不均匀性在la $ _ {2-x} $ sr $ _x $ nio $ _4 $
Nanoscale inhomogeneity of charge density waves dynamics in La$_{2-x}$Sr$_x$NiO$_4$
论文作者
论文摘要
虽然在许多复杂的相关系统中出现了电荷密度断裂的条纹阶段，但空间排序和动力学的异质性仍然难以捉摸。这种缺失的信息是了解量子复杂材料中的结构和功能关系的核心。在这里，我们将重点放在纳米级的电荷密度波（CDW）的空间异质性上，以LA $ _ $ _ {2-x} $ _ {2-x} $ _X $ _X $ _X $ nio $ _ {4+y} $ perovskite在低温下。我们报告了令人信服的证据，表明CDW在T <50K处的非常规运动与使用谐振软X射线光子相关光谱（XPC）的相关长度的减小有关。 The key result of this work is the direct visualization of nanoscale spatial inhomogeneity of CDW relaxation dynamics by scanning micro X-ray diffraction (SmXRD) showing a nanoscale landscape of percolating short range dynamic CDW puddles competing with large quasi-static CDW puddles giving rise to a novel form of nanoscale phase separation of the incommensurate stripes order landscape.
While stripe phases with broken rotational symmetry of charge density appear in many complex correlated systems, the heterogeneity of spatial ordering and dynamics remains elusive. This missing info is at the heart of understanding the structure and function relation in quantum complex materials. We focus here on the spatial heterogeneity of the motion of charge density wave (CDW) at nanoscale in the archetypal case of La$_{2-x}$Sr$_x$NiO$_{4+y}$ perovskite at low temperature. We report compelling evidence that the unconventional increasing motion of CDW at T < 50K is related with the decreasing of its correlation length using resonant soft X-ray photon correlation spectroscopy (XPCS). The key result of this work is the direct visualization of nanoscale spatial inhomogeneity of CDW relaxation dynamics by scanning micro X-ray diffraction (SmXRD) showing a nanoscale landscape of percolating short range dynamic CDW puddles competing with large quasi-static CDW puddles giving rise to a novel form of nanoscale phase separation of the incommensurate stripes order landscape.
