EPR study of the diluted magnetic semiconductor CuGa1-xmnxTe2

Electron paramagnetic resonance (EPR) experiments were made in the diluted magnetic semiconductor CuGa1-xMnxTe2, in the temperature range 70 < T < 300 K. The samples were synthesized by direct fusion of stoichiometric mixtures of the elements, with Mn composition from x=0.0 to 0.25. The EPR sp...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2008-09, Vol.320 (17), p.2155-2158
Main Authors: PEREZ, J, SILVA, P. J, DURANTE-RINCON, C. A, PRIMERA FERRER, J, FERMIN, J. R
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diamagnetism, paramagnetism and superparamagnetism
Exact sciences and technology
Magnetic properties and materials
Magnetic semiconductors
Physics
Studies of specific magnetic materials
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Summary:Electron paramagnetic resonance (EPR) experiments were made in the diluted magnetic semiconductor CuGa1-xMnxTe2, in the temperature range 70 < T < 300 K. The samples were synthesized by direct fusion of stoichiometric mixtures of the elements, with Mn composition from x=0.0 to 0.25. The EPR spectra were measured as function of temperature, Mn composition, and field orientation. The temperature variation of the resonance field shows a critical point at about 235 K, and is associated with a transition from the ferromagnetic to the superparamagnetic state. The resonance field was also measured as a function of the field angle, and displays a well-defined uniaxial symmetry. This uniaxial field depends on the Mn concentration and is due to tetragonal distortions induced by Mn2+ at Ga sites, and the demagnetizing effects due to formation of ferromagnetism (FM) Mn-clusters.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2008.03.056