Abstract
Magnetic and electron transport properties of Be-doped low-temperature-grown GaAs layers at low temperatures were studied. A nearly abrupt decrease of magnetization is observed at a temperature around 3.2 K where a discontinuous decrease in resistance is also observed. These observations are explained by cooperative transition of the electron states of AS Ga defects. First-principal calculations of the electron state of an AS Ga atom with a shallow acceptor Be atom show that at the transition, an AS Ga +ion is displaced to the interstitial site and becomes a neutral atom, leading to a magnetization annihilation. In addition, the displacement results in the generation of a hole in the valence band and enhance the electrical conduction.
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