Random Electric Field Instabilities of Relaxor Ferroelectrics
Relaxor ferroelectrics are complex oxide materials which are rather unique to study the effects of compositional disorder on phase transitions. Here, we study the effects of quenched cubic random electric fields on the lattice instabilities that lead to a ferroelectric transition and show that, with...
| Autores: | , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2017 |
| País: | Costa Rica |
| Recursos: | Universidad de Costa Rica |
| Repositório: | Kérwá |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/73335 |
| Acesso em linha: | https://www.nature.com/articles/s41535-017-0032-9 https://hdl.handle.net/10669/73335 |
| Access Level: | Acceso aberto |
| Palavra-chave: | ferroelectrics relaxors theory |
| Resumo: | Relaxor ferroelectrics are complex oxide materials which are rather unique to study the effects of compositional disorder on phase transitions. Here, we study the effects of quenched cubic random electric fields on the lattice instabilities that lead to a ferroelectric transition and show that, within a microscopic model and a statistical mechanical solution, even weak compositional disorder can prohibit the development of long-range order and that a random field state with anisotropic and power-law correlations of polarization emerges from the combined effect of their characteristic dipole forces and their inherent charge disorder. We compare and reproduce several key experimental observations in the well-studied relaxor PbMg1/3Nb2/3O3–PbTiO3. |
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