Effect of electric field on neutron scattering in lead magnoniobate

Diffuse neutron scattering in relaxor ferroelectric PbMg1/3Nb2/3O3

“…One of the probable explanations is related to the fact that the eigenvectors of the ionic displacements associated with the central peak (transverse) scattering can be decomposed into two different terms with only one of these terms being related to the polarization fluctuations. Indeed, in the paper [22] measurements of the structure factor of the CP were used to determine the eigenvectors of the corresponding ionic displacements. It was demonstrated, that the eigenvectors are neither purely optical nor acoustic.…”

Neutron scattering study of the relaxor ferroelectric(1−x)Pb(Zn1/3La-Orauttapong1, Toulouse2, Ye3 et al. 2003Phys. Rev. B757430View full textAdd to dashboardCite

“…Values of the correlation lengths obtained from measurements around different reflections in 4.5%PT at three temperatures, 720 K (T ≤ T d ), 500 K (T ∼ T * ), and 300 K (T < T * ), are also summarized in Table III. For this concentration, the correlation lengths are, respectively, about 4-18Å (or 1-4 unit cells), 13-30Å (3-7), and 51-91Å (13)(14)(15)(16)(17)(18)(19)(20)(21)(22), small at high temperature and growing upon cooling. The longest correlation length is observed around (110) and the shortest one around (310).…”

Competing Orders in PZN–xPT and PMN–xPT Relaxor Ferroelectrics

“…However, it does provide some important information for the local structures in these relaxor systems. Using this model, most previous diffuse scattering measurements on these systems can be easily explained -for instance, the Quantitative studies on diffuse scattering intensities across different Bragg peaks 48,51,58 can be used to obtain the magnitude of atomic displacements within a unit cell. It is shown that in both pure PMN and PZN-xPT crystals, the local atomic shifts in the PNR responsible for the diffuse scattering are always composed of two components: one optic component which gives rise to local polarizations; and one acoustic component, which is related to strains in the system.…”