Utilize este identificador para referenciar este registo:
http://hdl.handle.net/10773/20944
Título: | Dielectric barrier formation and tunneling magnetoresistance effect in strontium iron molybdate |
Autor: | Dem'yanov, S. E. Kalanda, N. A. Kovalev, L. V. Avdeev, M. V. Zheludkevich, M. L. Garamus, V. M. Willumeit, R. |
Data: | 2013 |
Editora: | MAIK NAUKA/INTERPERIODICA/SPRINGER |
Resumo: | A comparative X-ray diffraction study of the initial single-phase metal-oxide compound-strontium iron molybdate Sr2FeMoO6 - delta (SFMO)-and that subjected to additional isothermal annealing shows that this heat treatment leads to the appearance of a SrMoO4 (SMO) phase. Small-angle neutron scattering measurements indicate that the SMO phase forms a dielectric shell surrounding SFMO grains, which has a characteristic thickness of 2-4 nm and extends above 120 nm. The character of the temperature dependence of the electric resistance corresponds to the metal-type conduction in single-phase SFMO and changes to a semiconductor type in the material with SMO dielectric shells, which is evidence of a tunneling mechanism of charge transfer. This conclusion is confirmed by an increase in the absolute value of the negative magnetoresistance of SFMO due to the appearance of a tunneling magnetoresistance component of the same sign. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20944 |
DOI: | 10.1134/S1063785013060199 |
ISSN: | 1063-7850 |
Versão do Editor: | 10.1134/S1063785013060199 |
Aparece nas coleções: | CICECO - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
Dielectric barrier formation and tunneling magnetoresistance effect in strontium iron molybdate_10.1134S1063785013060199.pdf | 204.57 kB | Adobe PDF |
Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.