Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/85685
Título: | Modeling of polar clusters in disordered perovskites: The S-K model with tunneling |
Autor(es): | Almeida, B. G. Lacerda-Aroso, M. T. Ribeiro, J. L. Chaves, M. R. Almeida, A. |
Palavras-chave: | Solid-solid transitions Domains glass phase ferroelectricity |
Data: | 2000 |
Editora: | Taylor and Francis |
Revista: | Ferroelectrics |
Citação: | Almeida, B. G., Lacerda-arôcso, M. T., Ribeiro, J. L., Chaves, M. R., & Almeida, A. (2000, February). Modeling of polar clusters in disordered perovskites: The S-K model with tunneling. Ferroelectrics. Informa UK Limited. http://doi.org/10.1080/00150190008213324 |
Resumo(s): | The polar clusters generated by random non-central impurities in quantum paraelectrics determine to a great extent the complex dielectric behaviour observed in systems like SCT, KTN or KTL. The competition between a quantum paraelectric phase and an impurity-driven ferroelectric or glass phase depends on the concentration and on the nature of the interaction between clusters. This work presents a simple model in which each cluster is represented by a quantum two level system involving an effective Ising dipolar moment and a tunneling energy A. The interactions between clusters are taken into account by following the guide-lines of the Sherrington-Kirkpatrick model for spin glasses. General expressions for the polarization (P) and the Edwards-Anderson order parameter (q) are given and the phase diagram involving temperature, the normalized mean interaction energy J0/J and tunneling energy A/J0 is built. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/85685 |
DOI: | 10.1080/00150190008213324 |
ISSN: | 0015-0193 0015-0193 |
Versão da editora: | https://doi.org/10.1080/00150190008213324 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - FCD - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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SCT-paper-final.pdf | 420,77 kB | Adobe PDF | Ver/Abrir |