Temperature dependence of the diffuse scattering fine structure in equiatomic CuAu

Details Temperature dependence of the diffuse scattering fine structure in equiatomic CuAu Temperature dependence of the diffuse scattering fine structure in equiatomic CuAu

1998-10-23

arxiv.org/abs/cond-mat/9810322v1

Physics

Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.59.11105

The temperature dependence of the diffuse scattering fine structure from disordered equiatomic CuAu was studied using {\it in situ} x-ray scattering. In contrast to Cu$_3$Au the diffuse peak splitting in CuAu was found to be relatively insensitive to temperature. Consequently, no evidence for a divergence of the antiphase length-scale at the transition temperature was found. At all temperatures studied the peak splitting is smaller than the value corresponding to the CuAuII modulated phase. An extended Ginzburg-Landau approach is used to explain the temperature dependence of the diffuse peak profiles in the ordering and modulation directions. The estimated mean-field instability point is considerably lower than is the case for Cu$_3$Au.

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