Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor
Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor
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DOI：
10.1126/science.abd7213
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发表时间：
2020-03
期刊：
影响因子：
56.9
通讯作者：
S. Wandel;F. Boschini;E. H. da Silva Neto;L. Shen;M. Na;S. Zohar;Y. Wang;S. B. Welch;M. Seaberg;J. Koralek;G. Dakovski;W. Hettel;M.-F. Lin;S. Moeller;W. Schlotter;A. Reid;M. Minitti;T. Boyle;F. He;R. Sutarto;R. Liang;D. Bonn;W. Hardy;R. Kaindl;D. Hawthorn;J. Lee;A. Kemper;A. Damascelli;C. Giannetti;J. J. Turner-J.;G. Coslovich
中科院分区：
文献类型：
--
作者：
S. Wandel;F. Boschini;E. H. da Silva Neto;L. Shen;M. Na;S. Zohar;Y. Wang;S. B. Welch;M. Seaberg;J. Koralek;G. Dakovski;W. Hettel;M.-F. Lin;S. Moeller;W. Schlotter;A. Reid;M. Minitti;T. Boyle;F. He;R. Sutarto;R. Liang;D. Bonn;W. Hardy;R. Kaindl;D. Hawthorn;J. Lee;A. Kemper;A. Damascelli;C. Giannetti;J. J. Turner-J.;G. Coslovich
在铜氧化物超导体中，超导性和电荷密度波（CDW）是竞争但共存的有序。为了理解它们的微观相互依赖性，需要一种能够在自然长度和时间尺度上辨别它们相互作用的探针。我们使用超快共振软X射线散射跟踪CDW关联在YBa_2Cu_3O_（6 +x）中的瞬态演化后的超导性淬火的红外激光脉冲。我们观察到的CDW顺序的非热响应的特点是由一个近一倍的相关长度在0.1皮秒的超导淬火。我们的研究结果是一致的模型，其中超导性和CDW之间的相互作用，通过破坏空间相干性表现为不均匀的，超导性发挥主导作用，稳定CDW拓扑缺陷，如dispersiations。描述用光改变有序度的平衡电荷密度波（CDW）有序度，即电子密度的空间调制，在铜氧化物超导体中与超导性竞争。这种理解主要来自平衡实验，而这些秩序之间相互作用的动力学则较少被探索。Wandel等人使用超快激光脉冲快速淬灭YBa2Cu3O6+x超导体样品中的超导性，这暂时增强了CDW有序。该过程增加了CDW阶的相关长度，表明超导性稳定了通过抑制超导性而去除的CDW缺陷。用超快共振软X射线散射方法研究了YBa_2Cu_3O_（6 +x）中电荷密度波序的动力学过程。
Superconductivity and charge density waves (CDWs) are competitive, yet coexisting, orders in cuprate superconductors. To understand their microscopic interdependence, a probe capable of discerning their interaction on its natural length and time scale is necessary. We use ultrafast resonant soft x-ray scattering to track the transient evolution of CDW correlations in YBa2Cu3O6+x after the quench of superconductivity by an infrared laser pulse. We observe a nonthermal response of the CDW order characterized by a near doubling of the correlation length within ≈1 picosecond of the superconducting quench. Our results are consistent with a model in which the interaction between superconductivity and CDWs manifests inhomogeneously through disruption of spatial coherence, with superconductivity playing the dominant role in stabilizing CDW topological defects, such as discommensurations. Description Changing the balance of orders with light Charge-density wave (CDW) order, the spatial modulation of electronic density, is known to compete with superconductivity in copper oxide superconductors. This understanding comes largely from equilibrium experiments, and the dynamics of the interplay of these orders are less explored. Wandel et al. use ultrafast laser pulses to quickly quench superconductivity in samples of the YBa2Cu3O6+x superconductor, which temporarily enhanced the CDW order. The process increased the correlation length of the CDW order, suggesting that superconductivity stabilizes CDW defects that are removed by suppressing superconductivity. —JS Ultrafast resonant soft x-ray scattering is used to monitor the dynamics of the charge density wave order in YBa2Cu3O6+x.