Magnetic F Center in Chalcogenide Spinel Type Ferromagnetic Divalent Ionic Crystals

Abstract

Abstract. -Magnetic F center model consisting of two electrons trapped at an anion vacancy with their spins being parallel is proposed in connection with of the prominent red shift peak observed in CdCr2S4. With LCAO method it is shown that its ground state is 3E below T, and the peak is due to transition to its excited state.