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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Antiferromagnetism induced by oxygen vacancies in V2O5 polycrystals synthesized by the Pechini method

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