Temperature independent diffuse scattering and elastic lattice deformations in relaxor PbMg1/3Nb2/3O3

摘要

The results of diffuse neutron scattering experiment on PbMg1/3Nb2/3O3 singlecrystal above the Burns temperature are reported. It is shown that the hightemperature elastic diffuse component is highly anisotropic in low-symmetryBrillouin zones and this anisotropy can be described using Huang scatteringformalism assuming that the scattering originates from mesoscopic latticedeformations due to elastic defects. The qualitative agreement between thismodel and the experimental data is achieved with simple isotropic defects. Itis demonstrated that weak satellite maxima near the Bragg reflections can beinterpreted as the finite resolution effect.