Magnetic field controlled charge density wave coupling in underdoped YBa2Cu3O6+x.
Magnetic field controlled charge density wave coupling in underdoped YBa2Cu3O6+x.
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DOI：
10.1038/ncomms11494
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发表时间：
2016-05-05
影响因子：
16.6
通讯作者：
Hayden SM
中科院分区：
文献类型：
--
作者：
Chang J;Blackburn E;Ivashko O;Holmes AT;Christensen NB;Hücker M;Liang R;Bonn DA;Hardy WN;Rütt U;Zimmermann MV;Forgan EM;Hayden SM
磁场对层状铜酸盐的作用抑制了它们的高温超导行为，揭示了相互竞争的基态。在广泛研究的欠掺杂YBa2Cu3O6+x （YBCO）中，低温下场致电子和结构变化的微观性质尚不清楚。本文报道了YBCO中高场电荷密度波（CDW）的x射线研究。对于空穴掺杂~ 0.123，我们发现场（B ~ 10 T）仅沿CuO链（B方向）诱导额外的CDW相关，导致在B ~ 15 T沿该方向形成三维（3D）有序态。沿a方向的CDW信号也会被磁场增强，但不会形成额外的相关模式。磁场改变了YBCO结构中CuO2双分子层之间的耦合，导致三维CDW序列的突然出现。正如最近提出的那样，CDW在低场和高场下打破了单个双层的镜像对称性，从而允许费米表面重建。高温超导体中竞争序之间的相互作用可以通过磁场的应用来调节。在这里，Chang等人报道了在欠掺杂的YBa2Cu3O6.67中高场诱导的三维电荷密度波，这表明费米表面重构是由于竞争顺序。
The application of magnetic fields to layered cuprates suppresses their high-temperature superconducting behaviour and reveals competing ground states. In widely studied underdoped YBa2Cu3O6+x (YBCO), the microscopic nature of field-induced electronic and structural changes at low temperatures remains unclear. Here we report an X-ray study of the high-field charge density wave (CDW) in YBCO. For hole dopings ∼0.123, we find that a field (B∼10 T) induces additional CDW correlations along the CuO chain (b-direction) only, leading to a three-dimensional (3D) ordered state along this direction at B∼15 T. The CDW signal along the a-direction is also enhanced by field, but does not develop an additional pattern of correlations. Magnetic field modifies the coupling between the CuO2 bilayers in the YBCO structure, and causes the sudden appearance of the 3D CDW order. The mirror symmetry of individual bilayers is broken by the CDW at low and high fields, allowing Fermi surface reconstruction, as recently suggested. The interplay between competing orders in high-temperature superconductors can be tuned by the application of magnetic fields. Here, Chang et al. report high field induced three-dimensional charge density wave in underdoped YBa2Cu3O6.67, which suggests Fermi surface reconstruction due to competing orders.