High-temperature charge density wave correlations in La1.875Ba 0.125CuO4 without spin-charge locking
High-temperature charge density wave correlations in La1.875Ba 0.125CuO4 without spin-charge locking
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DOI：
10.1073/pnas.1708549114
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发表时间：
2017-11-21
影响因子：
11.1
通讯作者：
Dean, M. P. M.
中科院分区：
文献类型：
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作者：
Miao, H.;Lorenzana, J.;Dean, M. P. M.
虽然所有的超导铜氧化物都显示出电荷有序的趋势，但它们的低温特性是不同的，这阻碍了在单一概念框架内理解这种现象的努力。虽然有些系统呈现出电荷和自旋的条纹，具有锁定的周期性，但其他系统则具有电荷密度波（CDW），而没有任何明显相关的自旋顺序。在这里，我们使用共振非弹性X射线散射来跟踪在典型的条纹有序的铜氧化物La（1.875）Ba（0.125）CuO（4）在其有序过渡的电荷关联的演变。我们发现高温电荷相关性从自旋相关性的波矢中解锁，这表明与各种其他铜酸盐中的CDW相类似。这表明，条纹秩序在低温下是稳定的，否则独立的电荷和自旋密度波的耦合，具有重要意义的电荷和自旋之间的关系在铜酸盐的相关性。
Although all superconducting cuprates display charge-ordering tendencies, their low-temperature properties are distinct, impeding efforts to understand the phenomena within a single conceptual framework. While some systems exhibit stripes of charge and spin, with a locked periodicity, others host charge density waves (CDWs) without any obviously related spin order. Here we use resonant inelastic X-ray scattering to follow the evolution of charge correlations in the canonical stripe-ordered cuprate La(1.875)Ba(0.125)CuO(4 )across its ordering transition. We find that high-temperature charge correlations are unlocked from the wavevector of the spin correlations, signaling analogies to CDW phases in various other cuprates. This indicates that stripe order at low temperatures is stabilized by the coupling of otherwise independent charge and spin density waves, with important implications for the relation between charge and spin correlations in the cuprates.