共振X射线散射研究Dy离子在DyBa $_2$ Cu $_3$ O $_{6+x}$薄膜中的电荷和氧序印迹
Imprint of charge and oxygen orders on Dy ions in DyBa$_2$Cu$_3$O$_{6+x}$ thin films probed by resonant x-ray scattering
摘要：
利用共振弹性X射线散射技术研究了在$L_3$（110）衬底上外延生长的欠掺杂$_2$（DyBCO）薄膜中的电荷有序性。该薄膜显示出正交晶体结构与短程邻-II氧秩序的电荷库层。在Dy $M_5$边缘，我们观察到衍射峰与CuO $_2$平面中的二维电荷密度波和邻-II氧序的平面波矢相同，表明在稀土亚晶格上形成了诱导有序态。共振衍射峰的强度表现出非单调依赖于外部磁场。模型计算的调制的晶体电场在Dy网站的电荷和氧的顺序捕获的显着特征的磁场，温度和光子能量的散射强度的依赖性。
英文摘要：
We used resonant elastic x-ray scattering at the Cu $L_3$ and Dy $M_5$ edges to investigate charge order in thin films of underdoped DyBa$_2$Cu$_3$O$_{6+x}$ (DyBCO) epitaxially grown on NdGaO$_3$ (110) substrates. The films show an orthorhombic crystal structure with short-range ortho-II oxygen order in the charge-reservoir layers. At the Dy $M_5$ edge we observe diffraction peaks with the same planar wavevectors as those of the two-dimensional charge density wave in the CuO$_2$ planes and of the ortho-II oxygen order, indicating the formation of induced ordered states on the rare-earth sublattice. The intensity of the resonant diffraction peaks exhibits a non-monotonic dependence on an external magnetic field. Model calculations on the modulation of the crystalline electric field at the Dy sites by charge and oxygen order capture the salient features of the magnetic field, temperature, and photon energy dependence of the scattering intensity.
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