| Full text | |
| Author(s): |
dos Santos, Maria Elenice
[1, 2]
;
Ferreira, Rafael Aparecido
[1, 2]
;
Lisboa-Filho, Paulo Noronha
[3]
;
Pena, Octavio
[2]
Total Authors: 4
|
| Affiliation: | [1] Univ Rennes 1, Inst Sci Chim Rennes, UMR 6226, F-35042 Rennes - France
[2] UNESP Univ Estadual Paulista, Grp Mat Avancados, BR-17033360 Bauru, SP - Brazil
[3] Univ Estadual Paulista, Dept Fis, Fac Ciencias, BR-17033360 Bauru, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Journal of Magnetism and Magnetic Materials; v. 329, p. 53-58, MAR 2013. |
| Web of Science Citations: | 12 |
| Abstract | |
The structural and magnetic properties of the cubic spinel oxide Co2MnO4 (Fd3m space group) doped with different concentrations of bismuth, were investigated by X-ray diffraction and SQUID magnetometry. The Bi3+ ions entering into the Co-III octahedral sites do not alter the effective moment, mu(eff) similar to 8.2 mu(B), whereas both the magnetization M-50 kOe at the highest field (50 kOe) and the field-cooled M-FC magnetizations increased when increasing the Bi content. The ferrimagnetic character of the parent compound, Co2MnO4, is maintained for all materials although the antiferromagnetic interactions Co2+-Co2+ are affected, resulting in higher values of the Curie-Weiss temperature. Due to the large ionic radius of Bi, octahedra distortions occur as well as valence fluctuations of the Mn ions, giving rise to Jahn-Teller effects and enhancing the exchange interactions. The off-center Bi3+ ion is responsible of non-centrosymmetric charge ordering and should lead to multiferroisme conditions for the BixCo2-xMnO4 material. (C) 2012 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 07/08072-0 - Fundamental research in superconductivity and magnetism - systems potentially useful for aplications: advanced oxides and superconductors patterned with artificial structures |
| Grantee: | Wilson Aires Ortiz |
| Support Opportunities: | Research Projects - Thematic Grants |