Synchrotron x-ray-scattering study of the normal-incommensurate phase transition in Rb2ZnCl4

M.P. Zinkin, D.F. McMorrow, J.P. Hill, R.A. Cowley, J.G. Lussier, A. Gibaud, G. Grübel, C. Sutter

    Research output: Contribution to journalJournal articleResearch

    Abstract

    The results of high-resolution synchrotron x-ray-scattering experiments on the normal-incommensurate phase transition in Rb2ZnCl4 are reported. Measured critical exponents for the intensities of the first three harmonics of the incommensurate modulation wave below T-c agree well with theoretical predictions for the n=2, D=3 (SD-XY) universality class. The scattering observed above T-c corrresponds to critical fluctuations on two distinct length scales: the critical exponents for the short length scale component of the scattering agree with those expected for the 3D-XY universality class. The value found for the exponent of the inverse correlation length of the long length scale component is nu(s)=0.7+/-0.2. A comparison of data taken in Laue and Bragg geometries at different photon energies suggests that the second length scale scattering originates in the near-surface region. Possible explanations of the two length scale behavior are discussed.
    Original languageEnglish
    JournalPhysical Review B
    Volume54
    Issue number5
    Pages (from-to)3115-3124
    ISSN2469-9950
    DOIs
    Publication statusPublished - 1996

    Cite this

    Zinkin, M. P., McMorrow, D. F., Hill, J. P., Cowley, R. A., Lussier, J. G., Gibaud, A., Grübel, G., & Sutter, C. (1996). Synchrotron x-ray-scattering study of the normal-incommensurate phase transition in Rb2ZnCl4. Physical Review B, 54(5), 3115-3124. https://doi.org/10.1103/PhysRevB.54.3115