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Anomalous hall-effect results in low-temperature molecular-beam-epitaxial GaAs: Hopping in a dense EL2-like band

Physical Review B, ISSN: 0163-1829, Vol: 42, Issue: 6, Page: 3578-3581
1990
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Molecular-beam-epitaxial GaAs grown at very low temperatures (200°C) exhibits anomalous Hall-effect properties. Here we show conclusively that the room-temperature conduction is due to activated (nearest-neighbor) hopping in a deep defect band of concentration 3×1019 cm-3, and energy Ec-0.75 eV, along with conduction due to free carriers thermally excited from this band. At low measurement temperatures, variable-range hopping [exp(-T0/T)1/4] prevails. The conduction-band mobility can be well explained by neutral-deep-donor scattering in parallel with lattice scattering. © 1990 The American Physical Society.

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