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Correlation of Tc with the Rare Earth Size in (Ln)Ba2Cu3O6+x Superconductors (Ln = La, Nd, Sm, Eu, Yb “ Cocktails”): Single Crystal X-Ray Diffraction and Electron Microscopy Studies

  • Jean Galy
  • Renée Enjalbert
  • Patrice Millet
  • Marie José Casanove
  • Christian Roucau

Abstract

In a previous paper, structural systematics around non-stoichiometric perovskite derivatives, YBa2Cu3O9−n with n = 1, 2, 3, were developed implying Wadsley’s defects for the non-quantified n values [1]. In this series, YBa2Cu3O6+x (with 0 ≤ x ≤ 1) exhibits remarkable superconductive properties and, in agreement with other reported results, a more precise domain has been found with Tc above 90 K for 0.66 ≤ x ≤ 1. This orthorhombic phase is associated with high Tc values. It is well known that at high temperature, it undergoes an orthorhombic → tetragonal phase transition accompanied by O2 loss, this phenomenon being reversible.

Keywords

Rare Earth Tetragonal Phase Bright Field Image Bragg Reflection Orthorhombic Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Reference

  1. [1]
    J. Galy, R. Enjalbert, P. Millet, C. Faulmann P. Cassoux. J. Solid State Chem., in press.Google Scholar
  2. [2]
    P. Millet, R. Enjalbert, J. Galy, C. Faulmann, P. Cassoux, H. Rakoto S. Askénazy. C. R. Acad. Sci., in press.Google Scholar
  3. [3]
    H. Takei, H. Takeya, Y. Iye, T. Tamegai F. Sakai. Jpn. J. Appl. Phys. 26: L1425 (1987).Google Scholar
  4. [4]
    J. J. Capponi, C. Chaillout, A. W. Hewat, P. Lejay, M. Marezio, N. Nguyen, B. Raveau, J. L. Soubeyroux, J. L. Tholence R. Tournier. Europhys. Lett. 3: 301 (1987).Google Scholar
  5. [5]
    M. J. Casanove C. Roucau. Europhys. Lett., submitted.Google Scholar
  6. [6]
    C. Chaillout, M. A. Alario-Franco, J. J. Capponi, J. Chenavas, J. L. Hodeau M. Marezio. Phys. Rev. (Brief Comm.), in press.Google Scholar

Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • Jean Galy
    • 1
  • Renée Enjalbert
    • 1
  • Patrice Millet
    • 1
  • Marie José Casanove
    • 2
  • Christian Roucau
    • 2
  1. 1.Laboratoire de Chimie de Coordination CNRSToulouseFrance
  2. 2.Laboratoire d’Optique Electronique CNRSToulouseFrance

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