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Title: Dynamic fluctuations and static speckle in critical x-ray scattering from SrTiO(sub 3).

Abstract

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}.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
939070
Report Number(s):
ANL/XSD/JA-57392
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US200821%%138
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. Lett.; Journal Volume: 98; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; BRAGG REFLECTION; X-RAY DIFFRACTION; DIFFUSE SCATTERING; FLUCTUATIONS; STRONTIUM OXIDES; TITANIUM OXIDES; CRITICAL TEMPERATURE

Citation Formats

Holt, M., Sutton, M., Zschack, P., Hong, H., Chiang, T.-C., McGill Univ., and Univ. of Illinois. Dynamic fluctuations and static speckle in critical x-ray scattering from SrTiO(sub 3).. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.98.065501.
Holt, M., Sutton, M., Zschack, P., Hong, H., Chiang, T.-C., McGill Univ., & Univ. of Illinois. Dynamic fluctuations and static speckle in critical x-ray scattering from SrTiO(sub 3).. United States. doi:10.1103/PhysRevLett.98.065501.
Holt, M., Sutton, M., Zschack, P., Hong, H., Chiang, T.-C., McGill Univ., and Univ. of Illinois. Mon . "Dynamic fluctuations and static speckle in critical x-ray scattering from SrTiO(sub 3).". United States. doi:10.1103/PhysRevLett.98.065501.
@article{osti_939070,
title = {Dynamic fluctuations and static speckle in critical x-ray scattering from SrTiO(sub 3).},
author = {Holt, M. and Sutton, M. and Zschack, P. and Hong, H. and Chiang, T.-C. and McGill Univ. and Univ. of Illinois},
abstractNote = {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}.},
doi = {10.1103/PhysRevLett.98.065501},
journal = {Phys. Rev. Lett.},
number = 2007,
volume = 98,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}