Quantum Fluctuations of Charge Order Induce Phonon Softening in a Superconducting Cuprate
Quantum Fluctuations of Charge Order Induce Phonon Softening in a Superconducting Cuprate
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DOI：
10.1103/physrevx.11.041038
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发表时间：
2021-11-23
影响因子：
12.5
通讯作者：
Huang, D. J.
中科院分区：
文献类型：
--
作者：
Huang, H. Y.;Singh, A.;Huang, D. J.
量子相变在形成高温铜氧化物超导体的相图中起着重要的作用。这些铜氧化物具有相互交织的秩序，与超导性强烈相互作用。然而，与超导相的电荷序相关的量子临界点的证据仍然难以捉摸。在这里，我们揭示了近的最佳掺杂使用高分辨率共振非弹性X射线散射的La 2-xSrxCuO 4（LSCO）的短程电荷订单和量子涨落的光谱签名。通过一个图解框架进行计算，我们发现，电荷相关显着软化声子的几个分支。这些结果阐明了电荷序在LSCO化合物中的作用，为与电荷序相关的量子临界标度和色散提供了证据。
Quantum phase transitions play an important role in shaping the phase diagram of high-temperature cuprate superconductors. These cuprates possess intertwined orders which interact strongly with superconductivity. However, the evidence for the quantum critical point associated with the charge order in the superconducting phase remains elusive. Here, we reveal the short-range charge orders and the spectral signature of the quantum fluctuations in La2-xSrxCuO4 (LSCO) near the optimal doping using highresolution resonant inelastic x-ray scattering. On performing calculations through a diagrammatic framework, we discover that the charge correlations significantly soften several branches of phonons. These results elucidate the role of charge order in the LSCO compound, providing evidence for quantum critical scaling and discommensurations associated with charge order.