Neutron diffuse scattering from relaxor ferroelectric
Laboratory for Neutron Scattering, ETHZ &
Paul-Scherrer Institut CH-5232 Villigen PSI, Switzerland
2 Ioffe Physical Technical Institute - 26 Politekhnicheskaya 194021, St. Petersburg, Russia
Accepted: 23 May 2003
We report first single-crystal measurements on the relaxor ferroelectric by means of neutron scattering. We observe neutron diffuse scattering around the (110) Bragg position in the temperature range T=20–295. The diffuse scattering is found to be elongated in the transverse direction, as it is expected for polarization fluctuations in the presence of dipole-dipole forces. The susceptibility associated with this scattering decreases linearly with increasing temperature from T=100 up to 220. The corresponding correlation length ξ reaches a maximum of 42 near T=100. At room temperature, the diffuse scattering has a finite energy width indicating a relaxation time of .
PACS: 77.80.-e – Ferroelectricity and antiferroelectricity / 61.12.-q – Neutron diffraction and scattering
© EDP Sciences, 2003