Paramagnons, weak disorder and positive giant magnetoresistance

Details Paramagnons, weak disorder and positive giant magnetoresistance Paramagnons, weak disorder and positive giant magnetoresistance

1995-09-13

arxiv.org/abs/cond-mat/9509073v3

Physics

Condensed Matter

Disordered Systems and Neural Networks

Revised version. Basic idea and conclusions remain unaltered, major change in technical implementation. The theory presented h

Scientific paper

At low temperature and for finite spin scattering in a weakly disordered metal, for a certain value, predicted from our theory, of the material-dependent paramagnon interaction, the total conductivity becomes highly sensitive to the orbital effects of a finite magnetic field. As a consequence, positive giant magnetoresistance and giant corrections to the Hall coefficient arise. We obtain very good agreement between this theory and recent positive giant magnetoresistance experiments, while making specific material-dependent predictions.

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