Dynamic fluctuations and static speckle in critical x-ray scattering from SrTiO(sub 3).
The authors report a study of critical x-ray scattering from SrTiO{sub 3} near the antiferrodistortive structural phase transition at T{sub c} {approx} 105 K. A line shape analysis of the thermal diffuse scattering results in the most precise experimental determination to date of the critical exponent {gamma}. The microscopic mechanism behind the anomalous 'central peak' critical scattering component is clarified here by the first-ever observation of a static coherent diffraction pattern (speckle pattern) within the anomalous critical scattering of SrTiO{sub 3}. This observation allows us to directly attribute the origins of the central peak to Bragg diffraction from remnant static disorder above T{sub c}.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 939070
- Report Number(s):
- ANL/XSD/JA-57392; PRLTAO; TRN: US200821%%138
- Journal Information:
- Phys. Rev. Lett., Vol. 98, Issue 2007; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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