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Zeitschrift für Physik B Condensed Matter

, Volume 89, Issue 3, pp 285–288 | Cite as

Coexistence of valence fluctuating and stable Pr ions in Pr6O11

  • E. Holland-Moritz
Original Contributions

Abstract

Inelastic scattering experiments were performed with thermal neutrons on Pr6O11 in order to investigate the magnetic excitation spectrum. Two different kinds of behaviour were found in the response: first a rather broad feature, which is purely quasielastic for high temperatures and becomes inelastic at low temperatures, and second very narrow inelastic excitations which are interpreted as crystal-field (CF) splitting. This different behaviour can be explained as a consequence of vacancies on the oxygen sites in the cubic CaF2 structure. This yields Pr sites with at least two different coordination numbers. On sites with the full cubic coordination number of eight the Pr ion is intermediate valent (broad feature) and on sites with a lower coordination number the Pr ion is trivalent (CF excitations).

Keywords

Neural Network Coordination Number Excitation Spectrum CaF2 Thermal Neutron 
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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References

  1. 1.
    Bednorz, J.G., Müller, K.A.: Z. Phys. B—Condensed Matter64, 189 (1987)Google Scholar
  2. 2.
    Bednorz, J.G., Takashige, M., Müller, K.A.: Europhys. Lett.3, 379 (1987)Google Scholar
  3. 3.
    Wu, M.K., Ashburn, J.R., Torng, C.J., Hor, P.H., Meng, R.L., Gao, L., Huang, Z.J., Wang, Y.Q., Chu, C.W.: Phys. Rev. Lett.58, 908 (1987)Google Scholar
  4. 4.
    Hor, P.M., Meng, R.L., Wang, Y.Q., Gao, L., Huang, Z.J., Bechthold, J., Forster, K., Chu, C.W.: Phys. Rev. Lett.58, 1891 (1987)Google Scholar
  5. 5.
    Fisk, Z., Thompson, J.D., Zirngiebl, E., Smith, J.L., Cheong, S.W.: Solid State Commun.62, 743 (1987)Google Scholar
  6. 6.
    Soderholm, L., Zhang, K., Hinks, D.G., Beno, M.B., Jorgenson, J.D., Serge, C.U., Schuller, I.K.: Nature328, 604 (1987)Google Scholar
  7. 7.
    Bauchspieß, K.-R.: Diplom Thesis, Universität Köln 1982Google Scholar
  8. 8.
    Neumeier, J.J., Bjornholm, T., Maple, M.B., Rhyne, J.J., Gotaas, J.A.: Physica C166, 191 (1990)Google Scholar
  9. 9.
    Alp, E.E., Soderholm, L., Hinks, G.K., Veal, B.W., Montano, P.A.: Physica B150, 74 (1988)Google Scholar
  10. 10.
    Nekvasil, V., Holland-Moritz, E., Jostarndt, H.-D., Walter, U., Hilscher, G.: Submitted to ICM 91 (Edinburgh) J. Magn. Magn. Mater. (in press)Google Scholar
  11. 11.
    Skanthakamur, S., Li, W.-H., Lynn, J.W., Kebede, A., Crow, J.E., Mihalisin, T.: Physica B163, 239 (1990)Google Scholar
  12. 12.
    Soderholm, L., Goodman, G.L., Loong, C.-K.: J. Appl. Phys.67, 5067 (1990)Google Scholar
  13. 13.
    Jostarndt, H.-D., Walter, U., Harnischmacher, J., Kalenborn, J., Severing, A., Holland-Moritz, E.: Phys. Rev. B (in press)Google Scholar
  14. 14.
    Eyring, L., Baenzinger, N.C.: J. Appl. Phys.33, 428 (1962)Google Scholar
  15. 15.
    Holland-Moritz, E., Wohlleben, D., Loewenhaupt, M.: Phys. Rev.B25, 7482 (1982)Google Scholar
  16. 16.
    Holland-Moritz, E.: J. Magn. Magn. Mater47/48, 127 (1985)Google Scholar
  17. 17.
    Walter, U., Holland-Moritz, E.: Z. Phys. B—Condensed Matter45, 107 (1981)Google Scholar
  18. 18.
    Galera, R.M., Givord, D., Pierre, J., Murani, A.P., Vettier, C., Ziebeck, K.R.A.: J. Magn. Magn. Mater47/48, 139 (1985)Google Scholar
  19. 19.
    Holland-Moritz, E.: In: Frontiers in solid state science. Gupta, L.C., Multani, M.S. (eds.). Singapore: World Scientific 1993Google Scholar
  20. 20.
    Bauchspieß, K.R., Boksch, W., Holland-Moritz, E., Launois, H., Pott, R., Wohlleben, D.: In: Valence fluctuations in solids. Falicov, L.M., Hanke, W., Maple, M.B. (eds.), p. 417. New York: North-Holland 1981Google Scholar
  21. 21.
    Kern, S., Loong, C.-K., Faber, J., Lander, G.H.: Solid State. Commun.49, 295 (1984)Google Scholar
  22. 22.
    Kern, S., Trouw, F., Loong, C.-K., Lander, G.H.: J. Appl. Phys.67, 4830 (1990)Google Scholar
  23. 23.
    Holland-Moritz, E.: J. Magn. Magn. Mater38, 253 (1983)Google Scholar
  24. 24.
    Shapiro, S.M., Grier, B.H.: Phys. Rev. B25, 1457 (1982)Google Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • E. Holland-Moritz
    • 1
    • 2
  1. 1.II. Physikalisches InstitutUniversität zu KölnKöln 41Germany
  2. 2.Institut für FestkörperforschungForschungszentrum JülichJülichGermany

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