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Phys. Rev. B 71, 020102(R) (2005) [4 pages]

Diffuse x-ray scattering in perovskite ferroelectrics

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B. D. Chapman1,*, E. A. Stern1,2,†, S.-W. Han1,‡, J. O. Cross2, G. T. Seidler1,2, V. Gavrilyatchenko3, R. V. Vedrinskii3, and V. L. Kraizman3
1Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
2PNC-CAT, Sector 20, Advanced Photon Source, Argonne, Illinois 60439, USA
3Department of Physics, Rostov State University, Rostov, 344090 Russia

Received 11 November 2004; published 24 January 2005

Diffuse x-ray scattering measurements on the cubic paraelectric phase of single-crystal PbTiO3 are presented. No diffuse scattering sheets are found, in contrast to sheets observed in the cubic paraelectric phases of BaTiO3 and KNbO3. A quantitative analysis of the diffuse scattering indicates that the soft-mode branch contribution to sheets is negligible in all three ferroelectric perovskites. Differences in the diffuse scattering are explained by differences in the disordering of the local displacements, thus resolving a long-standing controversy.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.71.020102
DOI:
10.1103/PhysRevB.71.020102
PACS:
77.80.Bh, 61.10.Eq, 64.70.Kb, 77.84.Dy

*Present address: National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.

†Author to whom correspondence should be addressed; Electronic address: stern@phys.washington.edu

‡Present address: Chonbuk National University, Jeonju, 561-756, South Korea.

 
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