Formation of Incommensurate Charge Density Waves in Cuprates
Formation of Incommensurate Charge Density Waves in Cuprates
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DOI：
10.1103/physrevx.9.031042
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发表时间：
2019-09-06
影响因子：
12.5
通讯作者：
Dean, M. P. M.
中科院分区：
文献类型：
--
作者：
Miao, H.;Fumagalli, R.;Dean, M. P. M.
虽然电荷密度波（CDW）在铜氧化物高温超导体中无处不在，但它们发生在显著不同的波矢上，混淆了理解其形成机制的努力。在这里，我们使用共振非弹性x射线散射研究的掺杂和温度依赖的CDW在La 2-xCuO 4（x = 0.115-0.155）的演变。我们发现，随着温度的降低，CDW的发展分为两个阶段。在高温下首先出现具有准公量波矢的CDW前驱体。这种不依赖于掺杂的前体CDW相关性起源于与声子耦合的CDW相模，并以强烈依赖于掺杂的波矢“播种”低温CDW。我们的观察揭示了前体CDW及其相模式作为铜酸盐中高度缠结的电子基态的构建块。
Although charge density waves (CDWs) are omnipresent in cuprate high-temperature superconductors, they occur at significantly different wave vectors, confounding efforts to understand their formation mechanism. Here, we use resonant inelastic x-ray scattering to investigate the doping- and temperature-dependent CDW evolution in La2-xBaxCuO4 (x = 0.115-0.155). We discover that the CDW develops in two stages with decreasing temperature. A precursor CDW with a quasicommensurate wave vector emerges first at high temperature. This doping-independent precursor CDW correlation originates from the CDW phase mode coupled with a phonon and "seeds" the low-temperature CDW with a strongly doping-dependent wave vector. Our observation reveals the precursor CDW and its phase mode as the building blocks of the highly intertwined electronic ground state in the cuprates.