ELECTRON-PARAMAGNETIC RESONANCE OF THE MN4(0) CLUSTER IN SILICON

In high-resistivity p-type and n-type silicon doped with manganese the Mn//4**0 cluster is identified by EPR. The spectrum shows a characteristic hyperfine structure and an angular dependence of fine structure at 20 K. The analysis of the spectrum yield the assumption of the following cluster model: the cluster consists of four Mn**0 atoms on nearest interstitial sites; it has cubic/tetrahedral symmetry; spin multiplets with S equals 0,1,2,3,4,5, and 6 are produced by dominant exchange coupling where the multiplet with S equals 6 is the ground state observed by the EPR experiments. The photo-EPR results suggest a donor level (Mn//4)**0**/** plus near midgap.