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EPR studies of AsO44− spin-lattice-relaxation times in antiferroelectric NH4H2AsO4 and mixed glassy Rb1−x(NH4)xH2AsO4 (x=0.35)

S. Waplak, Z. Trybula, John E. Drumheller, and V. Hugo Schmidt

  • Physics Department, Montana State University, Bozeman, Montana 59717

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Phys. Rev. B 42, 7777 – Published 1 November, 1990

DOI: https://doi.org/10.1103/PhysRevB.42.7777

Abstract

The electron spin-lattice-relaxation time T1 was measured for x-ray-induced AsO44− centers in antiferroelectric NH4H2AsO4 (ADA) and mixed Rb1−x(NH4)xH2AsO4 (RADA, x=0.35) in the temperature range 4.2–300 K by the saturation method. It is shown that below T0 1/T1 reflects the direct relaxation process. From above T0 to 55 K, 1/T1∝T1.6 and can be described by a Vogel-Fulcher law 1/T1∼(T-T0). It is also shown that the flatness of 1/T1 in the temperature region from 55 to 120 K is due to the tunneling motion of nitrogen in the glassy phase of RADA. Contrary to ADA, the 1/T1 behavior in RADA reflects the fracton nature of relaxation in the spin-glass state.

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References (44)

  1. E. Courtens, Ferroelectrics 72, 229 (1987).
  2. H. J. Bruckner, E. Courtens and H. G. Unruh, Z. Phys. B 73, 337 (1988).
  3. S. Hayase, T. Futumara, H. Sakashita and H. Terauchi, J. Phys. Soc. Jpn. 54, 812 (1985).
  4. R. Blinc, J. Dolinšek, R. Pirc, B. Tadić and B. Zalar, Phys. Rev. Lett. 63, 2248 (1989).
  5. V. H. Schmidt, Ferroelectrics 72, 157 (1987).
  6. E. Courtens, T. F. Rosenbaum, S. E. Nagler and P. M. Horn, Phys. Rev. B 29, 515 (1984).
  7. Z. Trybula, V. H. Schmidt, J. E. Drumheller, D. He and Z. Li, Phys. Rev. B 40, 5289 (1989).
  8. R. Blinc, D. C. Ailion, B. Günther and S. Zumer, Phys. Rev. Lett. 57, 2826 (1986).
  9. J. Slak, R. Kind, R. Blinc and S. Žumer, Phys. Rev. B 30, 85 (1984).
  10. W. T. Sobol, I. G. Cameron, M. M. Pintar and R. Blinc, Phys. Rev. B 35, 7299 (1987).
  11. V. H. Schmidt, J. T. Wang, and P. Schnackenberg, Jpn. J. Appl. Phys. 24, Suppl. 2, 994 (1985).
  12. E. Courtens and H. Vogt, Z. Phys. B 62, 143 (1986).
  13. E. Courtens, R. Vacher and Y. Dagorn, Phys. Rev. B 33, 7625 (1986).
  14. K. Parlinski and H. Grimm, Phys. Rev. B 32, 1925 (1988).
  15. S. Waplak, Z. Trybula, J. E. Drumheller, and V. H. Schmidt (unpublished).
  16. M. Hampton, F. G. Herring, W. C. Lin and C. A. McDowell, Mol. Phys. 10, 565 (1966).
  17. N. S. Dalal, J. R. Dickinson and C. A. McDowell, J. Chem. Phys. 57, 4254 (1972).
  18. B. Lamotte, J. Gaillard and O. Constantinescu, J. Chem. Phys. 57, 3319 (1972).
  19. C. P. Poole, Jr., Electron Spin Resonance (Interscience, New York, 1967).
  20. J. P. Lloyd and G. E. Pake, Phys. Rev. 94, 579 (1954).
  21. M. J. Stephen and G. K. Frankel, J. Chem. Phys. 32, 1435 (1960).
  22. N. Bloembergen, E. M. Purcell and R. V. Pound, Phys. Rev. 73, 679 (1948).
  23. A. M. Portis, Phys. Rev. 91, 1071 (1953).
  24. Varian Instrument Division (Models E-109, E-112, E-115).
  25. R. Blinc, in Proceedings of the Tenth Ampe`re Summer School, Portorož, edited by R. Blinc, M. Vilfan, and J. Slak (J. Stefan Institute, Ljubljana, 1988), p. 143.
  26. J. E. Wertz and J. Bolton, Electron Spin Resonance (McGraw-Hill, New York, 1972).
  27. B. Ravkin and N. S. Dalal, Phys. Rev. B 39, 7009 (1989).
  28. V. Nanayanamurti and R. O. Pohl, Rev. Mod. Phys. 42, 201 (1970).
  29. E. O. Stejskal and H. S. Gutowsky, J. Chem. Phys. 28, 388 (1958).
  30. S. Clough, J. Phys. C 4, 2180 (1971).
  31. Z. T. Lalowicz, J. Phys. C 16, 2363 (1983).
  32. E. D. Wheeler, H. A. Farach, C. P. Poole, Jr., and R. J. Creswick, Phys. Rev. B 37, 9703 (1988).
  33. P. Cevc and M. Schara, Ferroelectrics 7, 113 (1976).
  34. G. H. Larson and C. D. Jeffries, Phys. Rev. 145, 311 (1966).
  35. A. Abragam and B. Bleaney, Electron Paramagnetic Resonance (Clarendon, Oxford, 1970), and references therein.
  36. C. Borczykowski and T. Kirski, Phys. Rev. B 40, 11335 (1989).
  37. M. Randeria, J. P. Sethna and R. G. Palmer, Phys. Rev. Lett. 54, 1324 (1985).
  38. S. Alexander, O. Entin-Wohlman, and R. Orbach,, J. Phys. (Paris) Lett. 46, L-549 (1985).
  39. S. Alexander, O. Entin-Wohlman, and R. Orbach,, J. Phys. (Paris) Lett. 46, L-555 (1985).
  40. R. Orbach, Science 231, 814 (1986), and references therein.
  41. S. Alexander and R. Orbach,, J. Phys. (Paris) Lett. 43, L-625 (1982).
  42. H. J. Stapleton, J. P. Allen, C. P. Flynn, D. G. Stinson and S. R. Kurtz, Phys. Rev. Lett. 45, 1456 (1980).
  43. I. A. Campbell, , J. Phys. (Paris) Lett. 46, L-1159 (1985).
  44. B. B. Mandelbrot, The Fractal Geometry of Nature (Freeman, New York, 1983).

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Phys. Rev. B 42, 7777– Published 1 November, 1990
  • Received 21 May 1990

© 1990 American Physical Society

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