论文标题
YBA2CU3O6.6在磁场中的平面内响应的红外光谱研究最多30特斯拉
Infrared spectroscopy study of the in-plane response of YBa2Cu3O6.6 in magnetic fields up to 30 Tesla
论文作者
论文摘要
使用Terahertz和红外光谱学，我们研究了在高磁场中，在高磁场中，TC = 58（1）k的单晶不足的YBA2CU3O6.6在高磁场上沿C轴施加了B = 30 Tesla的平面响应。我们的目标是研究场诱导的超导性抑制，并观察三维（3D）不稳定的铜电荷密度波（CU-CDW）的特征，该铜电荷密度波（CU-CDW）先前在这种高磁场上发育。我们的研究证实，超过20个特斯拉的B场会完全抑制超导冷凝物的宏观反应。然而，它揭示了高磁场处的3D Cu-CDW的弱特征。在30特斯拉时，Drude-Response（大约3％）的光谱重量的减小较弱，伴随着在90和240 cm-1左右的两种狭窄电子模式的增强，这些电子模式根据A-和B-Direction的CDW的固定相位模式来解释，并分别沿A-和B-Direction和So-B-Direction，以及Mir so-Mid ned ind-ind-infored（mir）。固定的分阶段模式和miR带是没有磁场的强特征，这表明突出但短距离且缓慢波动（与皮秒级红外时尺度相比）CDW相关性始终存在，即使在零磁场处。
With Terahertz and Infrared spectroscopy we studied the in-plane response of an underdoped YBa2Cu3O6.6 single crystal with Tc=58(1) K in high magnetic fields up to B=30 Tesla applied along the c-axis. Our goal was to investigate the field-induced suppression of superconductivity and to observe the signatures of the three dimensional (3d) incommensurate copper charge density wave (Cu-CDW) which was previously shown to develop at such high magnetic fields. Our study confirms that a B-field in excess of 20 Tesla gives rise to a full suppression of the macroscopic response of the superconducting condensate. However, it reveals surprisingly weak signatures of the 3d Cu-CDW at high magnetic fields. At 30 Tesla there is only a weak reduction of the spectral weight of the Drude-response (by about 3%) that is accompanied by an enhancement of two narrow electronic modes around 90 and 240 cm-1, that are interpreted in terms of pinned phase modes of the CDW along the a- and b-direction, respectively, and of the so-called mid-infrared (MIR) band. The pinned phased modes and the MIR band are strong features already without magnetic field which suggests that prominent but short-ranged and slowly fluctuating (compared to the picosecond IR-time scale) CDW correlations exist all along, i.e., even at zero magnetic field.
