高温超导体Bi2Sr2CaCu2O8 +y中晶格无公度超调制的空间不均匀性和手征对称性
Spatial inhomogeneity and chiral symmetry of the lattice incommensurate supermodulation in high temperature superconductor Bi2Sr2CaCu2O8+y
摘要：
利用扫描微区X射线衍射技术，对Tc=84 K的Bi_2Sr_2CaCu_2O_（8 +y）单晶中晶格无公度超调制的空间非均匀性进行了实空间和倒易空间混合可视化研究。该映射显示了超调制的振幅分布，在微尺度下具有约50%的振幅变化的大的晶格起伏。超调制振幅在a-b平面上的角分布表现出晶格手征对称性，形成左手取向的条纹图案。超调制的空间相关性可用压缩指数来描述，指数为1.5，相关长度约为50 μm，表明高温超导体中存在本征晶格无序。
英文摘要：
Using scanning micro X-ray diffraction we report a mixed real and reciprocal space visualization of the spatial heterogeneity of the lattice incommensurate supermodulation in single crystal of Bi2Sr2CaCu2O8+y with Tc=84 K. The mapping shows an amplitude distribution of the supermodulation with large lattice fluctuations at microscale with about 50% amplitude variation. The angular distribution of the supermodulation amplitude in the a-b plane shows a lattice chiral symmetry, forming a left-handed oriented striped pattern. The spatial correlation of the supermodulation is well described by a compressed exponential with an exponent of 1.5 and a correlation length of about 50 μm, showing the intrinsic lattice disorder in high temperature superconductors.
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