Magnetic-resonance studies of interstitial Mn in GaP and GaAs

Abstract

We report the observation of an additional electron-paramagnetic-resonance (EPR) center in neutron-irradiated GaP. The center labeled as GaP-NL1 was further investigated with the electron-nuclear double-resonance technique. We also observed another, similar EPR center in GaAs doped with Mn, which we label as GaAs-NL1. On the basis of this study, we were able to identify these centers as an interstitial Mn atom probably surrounded by four nearest-neighbor Ga atoms. We note that this is an observation by the EPR technique of an interstitial transition-metal impurity in a III-V compound.