文章基本信息

标题：Multiscale distribution of oxygen puddles in 1/8 doped YBa2Cu3O6.67
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作者：Alessandro Ricci ; Nicola Poccia ; Gaetano Campi 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2013
卷号：3
期号：1
DOI：10.1038/srep02383
语种：English
出版社：Springer Nature
摘要：Despite intensive research a physical explanation of high T_c superconductors remains elusive. One reason for this is that these materials have generally a very complex structure making useless theoretical models for a homogeneous system. Little is known on the control of the critical temperature by the space disposition of defects because of lack of suitable experimental probes. X-ray diffraction and neutron scattering experiments used to investigate y oxygen dopants in YBa₂Cu₃O_6+y lack of spatial resolution. Here we report the spatial imaging of dopants distribution inhomogeneity in YBa₂Cu₃O_6.67 using scanning nano X-ray diffraction. By changing the X-ray beam size from 1 micron to 300 nm of diameter, the lattice inhomogeneity increases. The ordered oxygen puddles size distribution vary between 6–8 nm using 1 × 1 μm² beam, while it is between 5–12 nm with a fat tail using the 300 × 300 nm² beam. The increased inhomogeneity at the nanoscale points toward a network of superconducting puddles made of ordered oxygen interstitials.