Substitutional disorder and charge localization in manganites

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Eduardo V Castro (Autor) Outra; Lopes dos Santos, JMBL (Autor) FCUP

Revista

Título: Journal of Physics Condensed Matter

Vol. 22

Página Final: 075601

ISSN: 0953-8984

Editora: Institute of Physics Publishing

Indexação

ISI Web of Knowledge - 11 Citações

Scopus - 1 Citação

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-003-933

DOI: 10.1088/0953-8984/22/7/075601

Abstract (EN): In the manganites RE(1-x)AE(x)MnO(3) (RE and AE being rare-earth and alkaline-earth elements, respectively) the random distribution of RE3+ and AE(2+) induces random, but correlated, shifts of site energies of charge carriers in the Mn sites. We consider a realistic model of this diagonal disorder, in addition to the double-exchange hopping disorder, and investigate the metal-insulator transition as a function of temperature, across the paramagnetic-ferromagnetic line, and as a function of doping x. Contrary to previous results, we find that values of parameters, estimated from the electronic structure of the manganites, are not incompatible with the possibility of a disorder-induced metal to insulator transition accompanying the ferromagnetic to paramagnetic transition at intermediate doping (x similar to 0.2-0.4). These findings indicate clearly that substitutional disorder has to be considered as an important effect when addressing the colossal magnetoresistance properties of manganites.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5