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Structure and oxygen stoichiometry for the electron-doped cuprate superconductor Nd1.85Ce0.15CuO4- delta.

  • Author(s): Kwei, GH;
  • Cheong, SW;
  • Fisk, Z;
  • Garzon, FH;
  • Goldstone, JA;
  • Thompson, JD
  • et al.
Abstract

We have determined the structure of the newly discovered electron-doped superconductor Nd1.85Ce0.15CuO4- at 11 and 300 K using high-resolution neutron-powder-diffraction techniques. Both nonsuperconducting oxygenated and superconducting Zr-gettered (Tc=24 K with shielding and Meissner fractions of 30 and 16% at 5 K, respectively) samples were investigated to study the effect of Zr gettering on the crystal structure and oxygen stoichiometry. We find that the structure remains tetragonal (I4/mmm), with no evidence for Nd/Ce ordering, for both samples at both temperatures. Structure and oxygen stoichiometry of the oxygenated and Zr-gettered samples remain remarkably similar at both temperatures, the only difference being a slight decrease (but greater than three standard deviations) in the thermal parameters of the rare-earth ions along the c axis for the superconducting sample. Thermogravimetric analyses confirm the oxygen stoichiometry determined from the structural refinements. © 1989 The American Physical Society.

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