A new model of correlated disorder in relaxor ferroelectrics

Autor:	Bosak, A., Chernyshov, D., Vakhrushev, S., Krisch, M.
Rok vydání:	2011
Předmět:	Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
Popis:	We propose a simple phenomenological picture to explain the unusual dielectric properties of the proto-typical ferroelectric relaxor lead magnesium niobate-titanate (PMN-PT). Our model assumes a specific, slowly changing, displacement pattern of the lead ion, which is indirectly controlled by the low-energy acoustic phonons of the system. The model qualitatively explains in great detail the temperature, pressure, and electric field dependence of diffuse neutron- and x-ray scattering, as well as the existence of hierachy in the relaxation times of these materials. We furthermore show that the widely used concept of polar nanoregions as indiviudal static entities is incompatible with the available body of experimental diffuse scattering results. Comment: 9 pages, 2 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1101.0490 Zobrazit plný text záznamu View this record from Arxiv