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Anomalous behavior of the Nd1.84Ce0.16CuO4 superconductor

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Abstract

The as-prepared electron-doped system Nd2−xCexCuO4 (where x≈0.16) is not superconducting. It becomes superconducting only after removal of a minuscule amount of extraneous oxygen (0.02 of O per unit formula). Mössbauer effect studies were carried out for oxygenated and deoxygenated Nd2−xCexCu(57Co)O4 with x=0.14, 0.16, and 0.18. The spectra show evidence of oxygen anions attaching to the probe57Co in apical positions, to form 5- and 6-coordinated species. A conventional procedure for deoxygenation brings about little change in the Mössbauer spectra both above and below the optimal superconducting concentration; however, for x=0.16, a dramatic change is observed—a major fraction of the magnetically split five-coordinated species manifests itself as a paramagnetically relaxed doublet upon deoxygenation, which costitutes a microscopic measure of the superconducting volume fraction. This apparently anomalous behavior at x≈0.16, where the extraneous oxygen is more readily desorbed, may be related to an electronic and/or local structural change in the CuO2 plane.

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Authors and Affiliations

  1. Department of Chemistry, Drexel University, 19104, Philadelphia, PA, USA

    N. S. Kopelev, V. Chechersky & A. Nath

  2. Department of Physics, University of Texas, 78712, Austin, TX, USA

    B. -H. O, M. I. Larkin & J. T. Markert

  3. Center for Superconductivity Research, Department of Physics, University of Maryland, 20742, College Park, MD, USA

    J. -L. Peng & R. L. Greene

Authors
  1. N. S. Kopelev
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  2. V. Chechersky
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  3. A. Nath
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  4. B. -H. O
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  5. M. I. Larkin
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  6. J. T. Markert
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  7. J. -L. Peng
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  8. R. L. Greene
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Kopelev, N.S., Chechersky, V., Nath, A. et al. Anomalous behavior of the Nd1.84Ce0.16CuO4 superconductor. Journal of Radioanalytical and Nuclear Chemistry, Articles 190, 391–400 (1995). https://doi.org/10.1007/BF02040017

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