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Imaging Spatial Ordering of the Oxygen Chains in YBa2Cu3O6+y at the Insulator-to-Metal Transition |
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| Authors: | G. Campi A. Ricci N. Poccia A. Bianconi |
| Affiliation: | 1. Institute of Crystallography, CNR, via Salaria Km. 29.300, Monterotondo, Roma, 00015, Italy 2. Deutsches Elektronen-Synchrotron DESY, Notkestra?e 85, 22607, Hamburg, Germany 3. MESA and Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE, Enschede, The Netherlands 4. RICMASS Rome International Center for Materials Science Superstripes, via dei Sabelli 119A, 00185, Roma, Italy |
| Abstract: | It is known that the mobile oxygen ions, y, in the basal plane of YBa2Cu3O6+y (0.33<y<0.67) form oxygen chains needed to create the metallic phase in the CuO2 layers. Here we visualize the spatial organization of oxygen chains in a crystal of YBa2Cu3O6+y very close to the insulator-to-superconductor transition with y=0.33 (T c =7 K). The distribution of oxygen defects chains has been obtained by performing scanning micro X-ray diffraction measurements. This experiment provides mixed real and reciprocal space information. We found a granular spatial pattern due to the oxygen chains being segregated in nanoscale puddles with ortho-II crystallographic structure embedded in an insulating matrix of disordered oxygen ions. |
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