Magnetic studies of persistent photoconductivity in n-AlxGa1-xAs

Low-temperature magnetic susceptibility measurements were made during illumination of n-Al2Ga1-xAs with DX centers to investigate the microscopic origin of persistent photoconductivity. Experiments using a dc SQUID magneto-optic microsusceptometer revealed the change of electronic susceptibility as a function of illumination time and temperature. The results indicate that the DX center is a paramagnetic donor with one unpaired electron. © 1989 The American Physical Society.