Temperature dependence of the diffuse scattering fine structure in equiatomic CuAu
| Autor: | Karl F. Ludwig, C. J. Sparks, Gene E. Ice, Oana Malis, Werner Schweika |
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| Rok vydání: | 1998 |
| Předmět: |
Materials science
Condensed matter physics Scattering Transition temperature Condensed Matter (cond-mat) Structure (category theory) FOS: Physical sciences Condensed Matter 01 natural sciences Instability 010305 fluids & plasmas Diffuse scattering Phase (matter) 0103 physical sciences ddc:530 010306 general physics |
| Zdroj: | Physical review / B 59, 11105-11108 (1999). |
| DOI: | 10.48550/arxiv.cond-mat/9810322 |
| Popis: | 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. Comment: 4 pages, 5 figures |
| Databáze: | OpenAIRE |
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