Abstract
By means of a quantitative analysis of extensive elastic neutron scattering experiments performed on theT c =78 K superconductor DyBa2Cu4O8 it is shown that two-dimensional (2D) antiferromagnetic Dy ordering in the (a,b)-plane remains stable in the whole temperature range fromT N =(1.10±0.02) K down to 7 mK. The magnetic difference pattern with good angular resolution fits well to the Warren equation for scattering on 2D systems with powder averaging. Consequently, the fitted sublattice magnetisation is found to have a 2D Ising character. Moreover, the Dy3+ crystal-field levels were determined by inelastic neutron scattering. From the resulting crystal-field parameters we calculate the sublattice magnetisation of Dy3+ at saturation to beμ Dy,CEF=6.0μ B in good agreement withμ Dy,obs=(5.9±0.5)μ B as measured by neutron diffraction.
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Roessli, B., Fischer, P., Zolliker, M. et al. Crystal-field splitting and temperature dependence of two-dimensional antiferromagnetism in the high-Tc compound DyBa2Cu4O8 . Z. Physik B - Condensed Matter 91, 149–153 (1993). https://doi.org/10.1007/BF01315229
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DOI: https://doi.org/10.1007/BF01315229