Author:

Keywords:

Science & Technology, Physical Sciences, Physics, Atomic, Molecular & Chemical, Physics, Condensed Matter, Physics, Nuclear, Physics, Spin-lattice relaxations, Dilute Fe3+, MgO, Emission Mossbauer spectroscopy, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, 0204 Condensed Matter Physics, General Physics, 5102 Atomic, molecular and optical physics, 5104 Condensed matter physics, 5106 Nuclear and plasma physics

Abstract:

We present a method to describe the temperature dependence of emission Mössbauer spectra showing slow spin-lattice relaxations of Fe3+ in MgO single crystals, obtained after implantation of 57Mn at ISOLDE/CERN. The analysis is based on the Blume-Tjon model for the line-shape of relaxing paramagnetic sextets with the spin relaxation rate, τ-1 as a parameter. The temperature dependent spin relaxation rate of Fe3+ in MgO is found to increase to ~108 s-1 at 647 K by assuming a relaxation rate of τ-1 < 106 s-1 at 77 K. The results are in accordance with those obtained by electron paramagnetic resonance spectroscopy demonstrating the possibility of retrieving spin-lattice relaxation rates of dilute Fe3+ from emission Mössbauer spectroscopy of Mn/Fe-implanted oxides. © 2010 Springer Science+Business Media B.V.