High Tc Superconductor, YBa2 Cu3 O7-$\delta$; (I) Its Preparation and Physicochemical Characterization

고온 초전도체 YBa2 Cu3 O7-$\delta$;(1) 합성 및 물리화학적 특성 연구

  • Published : 1988.02.01

Abstract

Almost single phase of Y1Ba2Cu3Ox, which exhibits the onset of superconducting transition at 90K, has been prepared via a conventional ceramic processing route followed by an anneal for a period of 10 hours at 45$0^{\circ}C$ in an atmosphere of 100% O2. The mean value for the oxygen content has been determined as x=6.85$\pm$0.02 by an iodometric titration technique. X-ray photoemission spectra are found to be consistent with a mixture of the d8(Cu3+) and d9(Cu2+) as the ground state and reveals that the local concentration of Cu3+ decreases with depth from the surface where x corresponds to 7.0. This is explained as being associated with the intercalation of oxygen during cooling from the annealing temperature.

Keywords

References

  1. Z. Phys. v.B64 no.189 J. G. Bednorz;K. A. Muller
  2. Phys. Rev. Lett. v.58 no.908 M. K. Wu;J. R. Ashbrun;C. J. Torng;P. H. Hor;R. L. Meng;L. Gao;Z. J. Huang;Y. Q. Wang;C. W. Chu
  3. Phys. Rev. Lett. v.58 no.1676 R. J. Cava;B. Batlogg;R. B. van Dover;D. W. Murphy;S. Sunshine;T. Siegrist;J. P. Remeika;E. A. Rietman;S. Zahurak;G. P. Espinosa
  4. Jpn. J. Appl. Phys. v.26 no.L619 E. Takayama-Muromachi;Y. Uchida;Y. Matsui;K. Kato
  5. Jpn. J. Appl. Phys. v.26 no.L777 Y. Matsui;E. Takayama-Muromachi;A. Ono;S. Horiuchi;K. Kato
  6. Jpn. J. Appl. Phys. v.26 no.L649 F. Izumi;H. Asano;T. Ishigaki;E. Takayama-Muromachi;Y. Uchida;N. Watanabe;T. Nishkawa
  7. Jpn. J. Appl. Phys. v.26 no.L649 F. Izumi(et al.)
  8. Jpn. J. Appl. Phys. v.26 no.L619 E. Takayama-Muromachi;R. Uchida;Y. Matsui;K. Kato
  9. Mat. Res. Bull. v.22 no.995 P. K. Gallagher;H. M. O'Bryan;S. A. Sunshine;D. W. Murphy
  10. Phys. Rev. J. D. Jorgensen;M. A. Beno;D. G. Hinks;K. J. Volin;R. L. Hitterman;J. D. Grace;I. K. Schuller
  11. Jpn. J. Appl. Phys. v.26 no.L476 E. Takayama-Muromachi;Y. Uchida;Y. Matsui;K. Kata
  12. Phys. Rev. v.B35 no.7242 P. M. Grant;R. B. Beyers;G. Lim;S. S. P. Parkin;M. L. Ramirez;V. Y. Lee;A. Nazzal;J. E. Vasquez;R. J. Savoy
  13. preparation J. H. Choy;S. H. Byeon;D. Y. Jung;S. T. Hong;G. Demazeau
  14. Appl. Phys. Lett. M. F. Yan(et al.)
  15. Europhys. Lett. v.3 no.1301 J. J. Capponi(et al.)
  16. Appl. Phys. Lett. M. A. Beno(et al.)
  17. Nature W.I.F. Davit(et al.)
  18. Comprehensive Inorganic Chemistry v.3 J. C. Bailer(et al.)
  19. Preprint A. Fujimori;E. Takayama-Muromachi;Y. Uchida;B. Okai
  20. Phys. Rev. v.B23 no.4369 G. van den Laan;C. Westra;C. Haas;G. A. Sawatzky
  21. Chem. Phys. Lett. v.48 no.596 S. Larsson;M. Braga
  22. J. Electron Spectrosc. Relat. Phenom. v.3 no.217 K. S. Kim
  23. J. Phys. Soc. Jpn. v.35 A. Kotani;Y. Toyozawa
  24. Anal. Chem. v.47 no.13 N. S. Mclntyre;M. G. Cook