Electron paramagnetic resonance of the “reentrant” insulating spin-glass EuxSr1-xS

Abstract Electron paramagnetic resonance is reported in the paramagnetic region of the insulating spin-glass Eu x Sr 1-x S for concentration ranges that exhibit both ferromagnetic and spin-glass phases. From the temperature dependence of the line positions and line widths, the low temperature phases can be anticipated and explained in terms of the energy level distributions of the total spin states.