Oxygen chain fragments are known to appear at the insulator-to-superconductor transition in YBa2Cu3O6+y. However, the self-organization and the size distribution of oxygen chain fragments are not known. Here, we seek to fill this gap, using scanning micro-x-ray diffraction, which is an imaging method based on advances in focusing a synchrotron radiation beam. This approach allows us to probe both real-space and k-space of high-quality YBa2Cu3O6.33 single crystals with Tc = 7 K. We report compelling evidence for nanoscale striped puddles, with Ortho-II structure, made of chain fragments in the basal Cu(1) plane with local oxygen concentration y = 0.5. The size of the Ortho-II puddles spans a range between 2 and 9 nm. The real-space imaging of Ortho-II puddles granular network shows that superconductivity, at a low hole-doping regime, occurs in a network of nanoscale oxygen ordered patches, interspersed with oxygen depleted regions. The manipulation by thermal treatments of the striped Ortho-II puddles has been investigated focusing on the spontaneous symmetry breaking near the order-to-disorder phase transition at T0 = 350 K.
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Prof. Antonio Bianconi Rome International Center for Materials Science Superstripes, RICMASS, Roma Italy „Imaging and controlling networks of nanoscale superconducting puddles in layered oxides by a novel synchrotron radiation microscopy: scanning nano x-ray diffraction"
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