超快时间分辨X射线散射揭示La $_{2-x}$ Ba $_x$ CuO $_4$中扩散电荷有序动力学
Ultrafast time-resolved x-ray scattering reveals diffusive charge order dynamics in La$_{2-x}$Ba$_x$CuO$_4$
摘要：
电荷序在高温$_c$铜酸盐中是普遍的，但它与超导性的关系还没有建立。人们普遍认为，虽然静态有序与超导性竞争，但动态有序可能是有利的，甚至有助于库珀配对。我们利用时间分辨共振软X射线散射研究了原型铜酸盐La $_{2-x}$ Ba $_x$ CuO $_4$中电荷序的集体动力学。我们发现，在能量尺度$0.4$ meV $ \lesssim ω\lesssim 2$ meV，激发过阻尼，并通过布朗扩散传播。在低于0.4 meV的能量尺度下，电荷序表现出动态临界缩放，显示出由拓扑缺陷传播引起的普遍行为。我们的研究表明，电荷序是动态的，因此可能有形地参与超导电性。
英文摘要：
Charge order is universal among high-T$_c$ cuprates but its relevance to superconductivity is not established. It is widely believed that, while static order competes with superconductivity, dynamic order may be favorable and even contribute to Cooper pairing. We use time-resolved resonant soft x-ray scattering to study the collective dynamics of the charge order in the prototypical cuprate, La$_{2-x}$Ba$_x$CuO$_4$. We find that, at energy scales $0.4$ meV $ \lesssim ω\lesssim 2$ meV, the excitations are overdamped and propagate via Brownian-like diffusion. At energy scales below 0.4 meV the charge order exhibits dynamic critical scaling, displaying universal behavior arising from propagation of topological defects. Our study implies that charge order is dynamic, so may participate tangibly in superconductivity.
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