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Evolution and control of oxygen order in a cuprate superconductor

Nature Materials volume 10, pages 733–736 (2011)Cite this article

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Abstract

The disposition of defects in metal oxides is a key attribute exploited for applications from fuel cells and catalysts to superconducting devices and memristors. The most typical defects are mobile excess oxygens and oxygen vacancies, which can be manipulated by a variety of thermal protocols as well as optical and d.c. electric fields. Here we report the X-ray writing of high-quality superconducting regions, derived from defect ordering1, in the superoxygenated layered cuprate, La2CuO4+y. Irradiation of a poor superconductor prepared by rapid thermal quenching results first in the growth of ordered regions, with an enhancement of superconductivity becoming visible only after a waiting time, as is characteristic of other systems such as ferroelectrics2,3, where strain must be accommodated for order to become extended. However, in La2CuO4+y, we are able to resolve all aspects of the growth of (oxygen) intercalant order, including an extraordinary excursion from low to high and back to low anisotropy of the ordered regions. We can also clearly associate the onset of high-quality superconductivity with defect ordering in two dimensions. Additional experiments with small beams demonstrate a photoresist-free, single-step strategy for writing functional materials.

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Figure 1: X-ray photoinduced i-O ordering experiment.
Figure 2: The nonlinear growth dynamics.
Figure 3: X-ray manipulation of high- Tc superconductors.

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Acknowledgements

We thank S. Agrestini, M. Colapietro, D. Di Castro, and the Elettra XRD beamline staff in Trieste for experimental help and R. Markiewicz and A. Coniglio for useful discussions. This experimental work has been carried out with the financial support of the European STREP project 517039 ‘Controlling Mesoscopic Phase Separation’ (COMEPHS) (2005–2008) and Sapienza University of Rome, research project ‘Stripes and High- Tc Superconductivity’.

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Authors and Affiliations

  1. Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185 Rome, Italy

    Nicola Poccia, Michela Fratini, Alessandro Ricci, Alessandra Vittorini-Orgeas & Antonio Bianconi

  2. Institute of Crystallography, CNR, via Salaria Km 29.300, Monterotondo Stazione, Roma I-00016, Italy

    Gaetano Campi

  3. Elettra Sincrotrone Trieste, Strada Statale 14-km 163,5, AREA Science Park, Trieste, 34149 Basovizza, Italy

    Luisa Barba

  4. Department of Physics, Northeastern University, 360 Huntington Ave., Boston, Massachusetts 02115, USA

    Ginestra Bianconi

  5. London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, 17-19 Gordon Street, London WC1H 0AH, UK

    Gabriel Aeppli

Authors
  1. Nicola Poccia
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Contributions

All authors contributed to providing experimental support, interpreting data and writing the manuscript. A.B., L.B., G.B., G.C., M.F., N.P., A.R. and A.V-O. performed the experiment. A.B., G.C., M.F., N.P. and A.R. performed sample manipulations. L.B. provided the X-ray beamline. N.P., G.A., G.B. M.F. and A.V-O. performed the data analysis. G.B. provided theoretical support. G.A., A.B. and N.P. wrote the paper.

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Correspondence to Antonio Bianconi.

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The authors declare no competing financial interests.

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Poccia, N., Fratini, M., Ricci, A. et al. Evolution and control of oxygen order in a cuprate superconductor. Nature Mater 10, 733–736 (2011). https://doi.org/10.1038/nmat3088

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