ALLOY SPLITTING OF THE TE-DX STATES IN ALXGA1-XAS

We report investigations of the Hall effect and conductivity of Te dop ed AlxGa1-xAs (x = 0.3). After illumination at low temperature, the co nductivity decreases in two steps on warming. These steps are explaine d in terms of the two sets of energy levels associated with two types of Te-DX centers depending on the neighboring host cation (Ga or Al) w hich undergoes the lattice relaxation. The observed persistent increas e in mobility is also explained in terms of the two different capture barriers.