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VOLUME 65 | ISSUE 12 | PAGE 887
Instability of the two-dimensional metallic phase to parallel magnetic field
We report on m&gnetotransport studies of the unusual two-dimensional metallic phase in high mobility Si-MOS structures. We have observed that the magnetic field applied in the 2D plane suppresses the metallic state, causing the resistivity to increase dramatically by more than 30 times. Over the total existence range of the metallic state, we have found three distinct types of the magnetoresistance, related to the corresponding quantum corrections to the conductivity. Our data suggest that the unusual metallic state is a consequence of both spinand Coulomb-interaction effects. PACS: 71.30.+h, 73.40.Qv