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Temperature dependence of the diffuse scattering fine structure in equiatomic CuAu

O. Malis·K. F. Ludwig, Jr.·W. Schweika·G. E. Ice·C. J. Sparks
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Abstract

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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O. Malis, K. F. Ludwig, Jr., W. Schweika, G. E. Ice, C. J. Sparks. 1998-10-23. Temperature dependence of the diffuse scattering fine structure in equiatomic CuAu. https://doi.org/10.1103/physrevb.59.11105

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