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A high-resolution X-ray scattering study of the effect of defects on the first-order transition in KMnF3 |
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| Authors: | A. Gibaud R. A. Cowley J. Nouet |
| Affiliation: | 1. Department of Physics , University of Edinburgh , Mayfield Road, Edinburgh , Scotland;2. Université du Maine, Faculté des Sciences, Laboratoire P.E.C. , U. A. no. 807 C.N.R.S., 72017, Le Mans , Cedex , France |
| Abstract: | A high-resolution X-ray scattering study of the influence of impurities on the cubic to tetragonal first-order phase transition of KMnF3 is presented. It is shown that Ca++ ions substituted for Mn++ or Na+ ions substituted for K+ ions at a 1% concentration can influence drastically both the nature and the critical fluctuations of this transition. A qualitative attempt of interpretation in terms of random stress effects is presented. |
| Keywords: | KMnF3 high-resolution X-ray scattering random stress |