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Nature of the Incommensurate Phase of Rb2ZnCl4

  • S. R. Andrews
  • H. Mashiyama
Part of the NATO ASI Series book series (NSSB, volume 106)

Abstract

Rb2ZnCl 4 is one of the many numbers of isomorphous compounds of the form A2BX4(A = K, Rb etc., B = Se, Zn etc., X = O, Cl, Br etc.) which undergo a continuous transition from a normal (N) phase (space group Pmcn) at a temperature Tc to a one dimensionally modulated incommensurate (IC) phase (see e.g. Iizumi et al 1977, de Pater and van Dijk 1978) characterised by a distortion with a periodicity that is an irrational fraction of the periodicity of the underlying lattice. The modulation wavevector of the incommensurate distortion, referred to the unit cell of the N phase, is given by q s = (1/3 - δ)C* where c is the pseudo-hexagonal axis. In Rb2ZnCl 4 δ ~ .029 just below Tc ~303 K (Mashiyama et al 1982) decreasing monotonically to zero at TL ~ 190 K where the IC phase locks into a commensurate (C) ferroelectric phase (p2lcn).

Keywords

Acoustic Mode Diffuse Scattering Incommensurate Phase Satellite Reflection Primary Satellite 
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References

  1. Andrews, S.R. and Mashiyama, H., 1983, to be published in J. Phys. CGoogle Scholar
  2. Bak, P. and Emery, V.J., 1976, Phys, Rev. Lett,.36, 978ADSCrossRefGoogle Scholar
  3. Blinc, R., Rutar, V., Topic, B., Milia, F., Alexandrova, I.P., Chaves, A.S. and Gazzinelli, R., 1981, Phys,. Rev. Lett.46, 1406ADSCrossRefGoogle Scholar
  4. Cowley, R.A., 1980, Adv. in Physics, 29, 1Google Scholar
  5. Harris, A.B., 1974, J. Phys. C7, 1671ADSCrossRefGoogle Scholar
  6. Iizumi, M., Axe, J.D., Shirane, G. and Shimaoka, K., 1977, Phys. Rev. B15, 4382ADSGoogle Scholar
  7. Le Guillou, J.C., and Zinn-Justin, J., 1980, Phys. Rev. B21, 3976ADSGoogle Scholar
  8. Mashiyama, H., 1981, J. Phys, Soc. Jpn., 50, 2655.ADSCrossRefGoogle Scholar
  9. Mashiyama, H. and Andrews, S.R., 1983, J. Phys. C, L247Google Scholar
  10. McMillan, W.L., 1976, Phys, Rev. B14, 1496.ADSGoogle Scholar
  11. de Pater, C.J. and van Dijk, C., 1978, Phys. Rev. B19, 4684Google Scholar
  12. Sham, L.J., and Patron, B.R., 1976, Phys. Rev. B13, 3151,Google Scholar

Copyright information

© Plenum Press 1984

Authors and Affiliations

  • S. R. Andrews
    • 1
  • H. Mashiyama
    • 2
  1. 1.Department of PhysicsUniversity of EdinburghEdinburghScotland, UK
  2. 2.Department of PhysicsYamaguchi UniversityYamaguchiJapan

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