Structural disorder and superconductivity suppression in NdBa2Cu3Oz (z ∼ 7)

V. V. Petrykin, E. A. Goodilin, J. Hester, E. A. Trofimenko, M. Kakihana, N. N. Oleynikov, Yu D. Tretyakov

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Structural features of a low-Tc nearly stoichiometric Nd1+xBa2-xCu3Oz phase (x ≤ 0.05, z ∼ 6.9, a = 3.897-3.899 Å, b = 3.902-3.908 Å, c = 11.707-11.719 Å) have been investigated for the first time by XRD, EXAFS structure refinement techniques and Raman spectroscopy. It has been found that the abnormal lattice parameters and the low superconductivity transition temperature (55 K) of such a phase are related to structural disorder in the Ba and Nd sites resulting in oxygen disordering which cannot be avoided by a standard oxidation procedure. It is shown that longer annealing at high temperatures is an important factor for reducing the oxygen disordering and hence enhancing superconducting properties after oxidation.

Original languageEnglish
Pages (from-to)16-32
Number of pages17
JournalPhysica C: Superconductivity and its applications
Volume340
Issue number1
DOIs
Publication statusPublished - 2000 Nov 15
Externally publishedYes

Keywords

  • EXAFS
  • NdBaCuO
  • Roman scattering spectroscopy
  • Structural disorder
  • Structure refinement
  • Superconductivity suppression

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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