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Study of the surface properties of NCCO electron-doped cuprate

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Abstract

Whenever one is interested in making high temperature superconductor-based devices, the goodness of the sample surface in terms of structural and electrical properties is a strong issue. In fact, it is well known that the surface of high Tc superconducting samples is not bulk-representative, due to air contamination and to the possible presence of oxygen vacancies. In addition, the quality of the surface layer results to be crucial in surface sensitive measurements as in X-ray photoelectron and Angle-resolved photoemission spectroscopy. Recently, some studies have been dedicated to the realization of devices based on electron-doped cuprates, bilayers and nanowires, showing the actual possibility to realize good quality junctions by using these cuprates. In this work, we report on the fabrication of thin films of the electron-doped Nd2−xCexCuO4±δ compound and analyze the surface natural barrier of as-grown films by means of point contact spectroscopy measurements. Suitable treatments of samples in an ozone rich atmosphere have been developed in order to improve the surface quality of the films. Auger electron spectroscopy has been used to monitor the effectiveness of these treatments.

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Authors and Affiliations

  1. CNR-DSFTM, NFFA-Trieste, Area Science Park, 34149, Basovizza (TS), Italy

    Anita Guarino

  2. CNR-SPIN – Napoli, 80125, Napoli, Italy

    Anita Guarino

  3. Dipartimento di Scienze e Tecnologie, Università del Sannio, 82100, Benevento, Italy

    Paola Romano & Francesco Avitabile

  4. CNR-SPIN – Salerno, 84084, Fisciano (SA), Italy

    Paola Romano, Antonio Vecchione & Angela Nigro

  5. CNR-IOM Laboratorio TASC, AREA Science Park, 34149, Basovizza (TS), Italy

    Jun Fujii, Ivana Vobornik & Giancarlo Panaccione

  6. Department of Physics, Temple University, Philadelphia, PA, 19122, USA

    Adele Ruosi

  7. Dipartimento di Fisica E. R. Caianiello, Università di Salerno, 84084, Fisciano (SA), Italy

    Angela Nigro

Authors
  1. Anita Guarino
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  2. Paola Romano
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  3. Jun Fujii
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  4. Adele Ruosi
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  5. Francesco Avitabile
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  6. Ivana Vobornik
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  7. Giancarlo Panaccione
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  8. Antonio Vecchione
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  9. Angela Nigro
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Corresponding author

Correspondence to Francesco Avitabile.

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Guarino, A., Romano, P., Fujii, J. et al. Study of the surface properties of NCCO electron-doped cuprate. Eur. Phys. J. Spec. Top. 228, 733–739 (2019). https://doi.org/10.1140/epjst/e2019-800208-9

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  • DOI: https://doi.org/10.1140/epjst/e2019-800208-9

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