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

Michela Fratini, Nicola Poccia, Alessandro Ricci, Gaetano Campi, Manfred Burghammer, Gabriel Aeppli and Antonio Bianconi ()
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Michela Fratini: Sapienza University of Rome, Piazzale Aldo Moro 2, 00185 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
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

Nature, 2010, vol. 466, issue 7308, 841-844

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.

Date: 2010
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DOI: 10.1038/nature09260

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