Abstract
The magnetoconductance of insulating amorphous alloys is investigated at very low temperature. In bulk 3D samples we observe a crossover at T=100mK from a high temperature Mott hopping regime to an activated regime. The latter regime extends up to higher temperature in thin films, and the I-V curves indicate the existence of single electron charging effects. The magnetic field reinforces the electronic localization in these insulators with strong spin-orbit scattering.
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