Three-dimensional charge density wave order in YBa2Cu3O6.67 at high magnetic fields
Three-dimensional charge density wave order in YBa2Cu3O6.67 at high magnetic fields
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DOI：
10.1126/science.aac6257
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发表时间：
2015-11-20
期刊：
影响因子：
56.9
通讯作者：
Lee, J. -S.
中科院分区：
文献类型：
--
作者：
Gerber, S.;Jang, H.;Lee, J. -S.
电荷密度波(CDW)关联普遍存在于铜酸盐超导体中。然而，从核磁共振推断的它们在高场的性质与在零场和低场的X射线散射测量的性质是不同的。我们将脉冲磁体与x射线自由电子激光相结合，通过高达28特斯拉的x射线散射来表征YBa2Cu3O6.67中的CDW。虽然零场CDW在低于150开尔文的温度下形成，基本上是二维的，但在较低的温度和15特斯拉以上，另一个三维有序的CDW出现了。场致CDW出现在零场超导转变温度附近；相反，无公度的面内有序矢量与场无关。这意味着CDW和高温超导的两种形式是紧密相连的。
Charge density wave (CDW) correlations have been shown to universally exist in cuprate superconductors. However, their nature at high fields inferred from nuclear magnetic resonance is distinct from that measured with x-ray scattering at zero and low fields. We combined a pulsed magnet with an x-ray free-electron laser to characterize the CDW in YBa2Cu3O6.67 via x-ray scattering in fields of up to 28 tesla. While the zero-field CDW order, which develops at temperatures below similar to 150 kelvin, is essentially two dimensional, at lower temperature and beyond 15 tesla, another three-dimensionally ordered CDW emerges. The field-induced CDW appears around the zero-field superconducting transition temperature; in contrast, the incommensurate in-plane ordering vector is field-independent. This implies that the two forms of CDW and high-temperature superconductivity are intimately linked.