EPR study of the diluted magnetic semiconductor CuGa1−xMnxTe2 |
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| Authors: | J Pérez PJ Silva CA Durante-Rincón J Primera Ferrer JR Fermin |
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| Institution: | 1. Departamento de Física, Facultad de Ciencias, Universidad del Zulia, Apartado. Postal 526, Maracaibo 4001, Zulia, Venezuela;2. Laboratorio de Física de la Materia Condensada, Centro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), Carretera Panamericana Km. 11, Apartado 21827, Caracas 1020-A, Venezuela |
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| Abstract: | 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. |
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| Keywords: | Superparamagnetism Magnetic anisotropy Paramagnetic resonance Diluted magnetic semiconductor Clustering |
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