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Superconductivity over 30 K of Nd2CuO4 Films on CaF2 Substrates

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Abstract

Nd2CuO4 has a crystal structure called the Nd2CuO4 (T’) structure in which fluorite-like Nd2O2 slabs and CuO2 planes stack alternately. Nd2CuO4 is known to show superconductivity by carrier doping via anion/cation substitution, or making the oxygen sublattice highly ordered via a stringent control of thermodynamic conditions during crystal growth. In this study, CaF2 is used for growing Nd2CuO4 films, as a substrate material which contains fluorine atoms. The films show superconducting onset (\(T_{\mathrm {c}}^{\text {on}}\)) beyond 30 K. Furthermore, in contrast to reported superconductivity in this system, the emergence of superconductivity is found to be insensitive to post annealing procedures.

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Authors and Affiliations

  1. Department of Applied Physics, Tokyo University of Agriculture and Technology, 2–24–16, Naka-cho, Koganei, Tokyo, 184-8588, Japan

    Yoshiko Nanao & Michio Naito

  2. School of Physics and Astronomy, University of St. Andrews, JF Allen Building, North Haugh, St. Andrews, Fife, KY16 9SS, Scotland

    Yoshiko Nanao

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  1. Yoshiko Nanao
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  2. Michio Naito
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Correspondence to Yoshiko Nanao.

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Nanao, Y., Naito, M. Superconductivity over 30 K of Nd2CuO4 Films on CaF2 Substrates. J Supercond Nov Magn 33, 121–125 (2020). https://doi.org/10.1007/s10948-019-05287-2

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  • DOI: https://doi.org/10.1007/s10948-019-05287-2

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