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Charge Order at High Temperature in Cuprate Superconductors
Journal of the Physical Society of Japan ( IF 1.7 ) Pub Date : 2021-09-14 , DOI: 10.7566/jpsj.90.111005
Riccardo Arpaia 1 , Giacomo Ghiringhelli 2, 3
Affiliation  

The presence of different electronic orders other than superconductivity populating the phase diagram of cuprates suggests that they might be the key to disclose the mysteries of this class of materials. In particular charge order in the form of charge density waves (CDW), i.e., the incommensurate modulation of electron density in the CuO2 planes, is ubiquitous across different families and presents a clear interplay with superconductivity. Until recently, CDW had been found to be confined inside a rather small region of the phase diagram, below the pseudogap temperature and the optimal doping. This occurrence might shed doubts on the possibility that such “low temperature phenomenon” actually rules the properties of cuprates either in the normal or in the superconducting states. However, recent resonant X-ray scattering (RXS) experiments are overturning this paradigm. It results that very short-ranged charge modulations permeate a much wider region of the phase diagram, coexisting with CDW at lower temperatures and persisting up to temperatures well above the pseudogap opening. Here we review the characteristics of these high temperature charge modulations, which are present in several cuprate families, with similarities and differences. A particular emphasis is put on their dynamical character and on their coupling to lattice and magnetic excitations, properties that can be determined with high resolution resonant inelastic x-ray scattering (RIXS).

中文翻译:

铜酸盐超导体的高温电荷顺序

在铜酸盐相图中存在除超导之外的不同电子序,这表明它们可能是揭示这类材料奥秘的关键。特别是电荷密度波 (CDW) 形式的电荷顺序,即 CuO 2中电子密度的不相称调制平面,在不同的家族中无处不在,并且与超导性有着明显的相互作用。直到最近,人们才发现 CDW 被限制在相图的一个相当小的区域内,低于赝隙温度和最佳掺杂。这一事件可能让人怀疑这种“低温现象”实际上支配了铜酸盐在正常状态或超导状态下的性质的可能性。然而,最近的共振 X 射线散射 (RXS) 实验正在颠覆这一范式。结果是非常短程的电荷调制渗透到相图的更宽区域,在较低温度下与 CDW 共存并持续到远高于赝隙开口的温度。在这里,我们回顾了这些高温电荷调制的特性,它们存在于几个铜酸盐家族中,有相似之处和不同之处。特别强调它们的动力学特性以及它们与晶格和磁激发的耦合,这些特性可以通过高分辨率共振非弹性 X 射线散射 (RIXS) 来确定。
更新日期:2021-09-14
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