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Scale-free structural organization of oxygen interstitials in La2CuO4+y

Author

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  • Michela Fratini

    (Sapienza University of Rome, Piazzale Aldo Moro 2, 00185 Roma, Italy
    Present address: Institute for Photonic and Nanotechnologies, CNR, Via Cineto Romano 42, 00156 Roma, Italy.)

  • Nicola Poccia

    (Sapienza University of Rome, Piazzale Aldo Moro 2, 00185 Roma, Italy)

  • Alessandro Ricci

    (Sapienza University of Rome, Piazzale Aldo Moro 2, 00185 Roma, Italy)

  • Gaetano Campi

    (Sapienza University of Rome, Piazzale Aldo Moro 2, 00185 Roma, Italy
    Institute of Crystallography, CNR, Via Salaria Km 29.300, Monterotondo Stazione, Roma, I-00016, Italy)

  • Manfred Burghammer

    (European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble Cedex, France)

  • Gabriel Aeppli

    (University College London)

  • Antonio Bianconi

    (Sapienza University of Rome, Piazzale Aldo Moro 2, 00185 Roma, Italy)

Abstract

Superconductivity enhanced by fractal organization The oxygen interstitials in the spacer layers that separate the superconducting CuO2 planes undergo ordering phenomena in Sr2O1+y CuO2, YBa2Cu3O6+y and La2CuO4+y that induce enhancements in the transition temperatures (Tc) with no changes in hole concentrations. It is also known that complex systems often have a scale-invariant structural organization, but hitherto none had been found in high-Tc copper oxides. Fratini et al. report that the ordering of oxygen interstitials in the La2O2+y spacer layers of La2CuO4+y high-Tc superconductors is characterized by a fractal distribution up to a maximum limiting size of 0.5 millimetres. Intriguingly, these fractal distributions of dopants appear to enhance superconductivity at high temperature.

Suggested Citation

  • Michela Fratini & Nicola Poccia & Alessandro Ricci & Gaetano Campi & Manfred Burghammer & Gabriel Aeppli & Antonio Bianconi, 2010. "Scale-free structural organization of oxygen interstitials in La2CuO4+y," Nature, Nature, vol. 466(7308), pages 841-844, August.
    • Handle: RePEc:nat:nature:v:466:y:2010:i:7308:d:10.1038_nature09260
    DOI: 10.1038/nature09260
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