On the magnetic hyperfine interaction in Ga2Se3:EuSe defect crystals

The electron structure impurity nuclei Eu-151 of Ga2Se3 defect compounds have been investigated by electron spin resonance and Mossbauer spectroscopy at temperatures between 77 and 300K. Mossbauer spectra in samples were recorded at MS 700 M set up with Sm2O3 as the sources and isomer shift values were determined relative to EuF3. The microscopic properties of Ga2Se3:EuSe single crystals defect compounds have been studied by atomic absorption analysis and X-ray fluorescence analysis at room temperature. The temperature dependence of the magnetic hyperfine fields was also analyzed by using the spin-wave theory and the molecular-field model. We determined the Debye temperature OD and the charge states for Eu-151 which turned out to be Eu2+(f(7)) ion with spin 7/2. (C) 2004 Elsevier B.V. All rights reserved.