Abstract
Abstract With ENDOR measurements the ligand hyperfine and quadrupole interactions of Ni3+ in GaP with 3 shells of P neighbours and 3 shells of Ga neighbours could be resolved. It was established that the effective spin is 3 2 , thus the defect is in the 3d7 state, which confirms the earlier assignment of the centre as an Ni3+ from ESR measurements. From the quadrupole interaction of the nearest Ga neighbours it can be concluded that Ni3+ is substitutional for Ga. From ENDOR-induced ESR experiments an upper limit for the u-parameter of the B·S3 term in the Spin Hamiltonian was determined. The unpaired spin density distribution shows a pronounced tetrahedral symmetry along the [111]-directions.
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