| Full text | |
| Author(s): |
Dreifus, D.
[1]
;
Godoy, M. P. F.
[1]
;
Rabelo, A. C.
[2]
;
Rodrigues, A. D.
[1]
;
Gobato, Y. G.
[1]
;
Camargo, P. C.
[1]
;
Pereira, E. C.
[2]
;
de Oliveira, A. J. A.
[1]
Total Authors: 8
|
| Affiliation: | [1] Univ Fed Sao Carlos UFSCar, Dept Fis, Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos UFSCar, Dept Quim, Sao Carlos, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | JOURNAL OF PHYSICS D-APPLIED PHYSICS; v. 48, n. 44 NOV 11 2015. |
| Web of Science Citations: | 0 |
| Abstract | |
Optical and magnetic properties of V2O5 polycrystals were investigated through photoluminescence (PL) and magnetization measurements. The PL spectra comprise two main bands attributed to oxygen vacancies and to band-edge-related transitions. The magnetization measurements showed a predominant paramagnetic behavior in the temperature range studied (5 K-300 K) with a superimposed peak around 80 K associated with an antiferromagnetic phase. The temperature dependence of the magnetic results and the relative PL intensity presented a remarkable correlation while in the range of 80-200 K the intensity associated with oxygen vacancies became considerably more intense than band-to-band emissions, the same range in which the antiferromagnetic transition was observed. The observation of an antiferromagnetic phase in V2O5 was predicted in the literature although this result had not previously been measured experimentally. Raman spectroscopy was used as a complementary technique in order to exclude the presence of spurious vanadium oxide phases in the sample. (AU) | |
| FAPESP's process: | 13/17657-2 - Synthesis and optical properties of semiconductor systems for spintronics |
| Grantee: | Marcio Peron Franco de Godoy |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 12/24025-0 - Magnetic, electrical and magnetostrictive properties of multiferroic composites and dilute magnetic semiconductors oxides |
| Grantee: | Adilson Jesus Aparecido de Oliveira |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |