Abstract
The Eu2+ defect in BaFBr and the Fe3+ defect in InP were investigated by optical detection of electron paramagnetic resonance (ODEPR). For both defects allowed ( Delta ms=+or-1) and forbidden ( Delta ms=+or-2) ODEPR transitions were observed. Some of the allowed ODEPR transitions showed an anomalous change of sign indicating a spin polarization enhancement. This anomalous behaviour of both spin systems (S=7/2 for Eu2+ in BaFBr and S=5/2 for Fe3+ in InP) arises from spin-lattice relaxations within the Eu2+ and Fe3+ Zeeman levels which operate faster for forbidden ( Delta ms=+or-2) transitions than for allowed transitions. Using the appropriate rate equations describing the two spin systems and taking into account strong forbidden spin-lattice relaxation, the measured ODEPR effects were explained.
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