Optical spectra of the colloidal Fe-doped manganate CaMn1−xFexO3 (x = 0, 0.01, 0.03, 0.05)

We report the optical behaviors of the Fe-doped CaMnO 3 family of compounds at low doping concentrations x ≤ 5%. The study aims at assisting the evaluation of the competition between ferroand antiferromagnetic orderings, which is believed to be a cause of many interesting properties of this class of...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2013, 62(12), , pp.2133-2138
Main Authors: Pham, Duc Huyen Yen, Nguyen, Duc Tho, Pham, Duc Thang, Hoang, Nam Nhat, Pham, The Tan
Format: Article
Language:English
Subjects:
Mathematical and Computational Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Theoretical
물리학
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Summary:We report the optical behaviors of the Fe-doped CaMnO 3 family of compounds at low doping concentrations x ≤ 5%. The study aims at assisting the evaluation of the competition between ferroand antiferromagnetic orderings, which is believed to be a cause of many interesting properties of this class of compounds, including the magnetization reversal effect recently discovered. The structural characterization showed a predominant orthorhombic phase with slightly increased cell constants due to doping. The Raman spectra revealed changes associated with the Mn sites, and the IR absorption spectrum showed a characteristic Fe band at 1.2 eV, which should be accompanied by a change of spin. The analysis of the magnetization data allowed us to predict that while the doping reduced the ferromagnetic coupling strength, and therefore the T C , the maximal doping concentration for the effective exchange to be zero was around 14%.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.62.2133