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We have studied the neutron diffuse scattering in the relaxor PMN. Thediffuse scattering appears around the Burns temperature (~620K), indicating itsorigin from the polar nanoregions (PNR). While the relative diffuse intensitiesare consistent with previous reports, they are entirely different from those ofthe lowest-energy TO phonon. Because of that, it has been considered that thisTO mode could not be the ferroelectric soft mode. Recently, a neutronscattering study has unambiguously shown that the TO mode does soften oncooling. If the diffuse scattering in PMN originates from the soft modecondensation, then the atomic displacements must satisfy the center of masscondition. But, the atomic displacements determined from diffuse scatteringintensities do not fulfill this condition. To resolve this contradiction, wepropose a simple model in which the total atomic displacement consists of twocomponents: $\delta_{CM}$ is created by the soft mode condensation, satisfyingthe center of mass condition, and, $\delta_{shift}$ represents a uniformdisplacement of the PNR along their polar direction relative to the surrounding(unpolarized) cubic matrix. Within this framework, we can successfully describethe neutron diffuse scattering intensities observed in PMN.Comment: 7 pages, 7 figures (Revised: 11-16-2001

physical review. b, condensed matter

Neutron diffuse scattering from polar nanoregions in the relaxor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Pb</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Nb</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>/</mml:…

Neutron diffuse scattering from polar nanoregions in the relaxorPb(Mg1/3Nb2/