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Numerical calculation for large positive magnetoresistance ratios I insulating materials

Rosenbaum, R. ; Schoepe, Wilfried ; Castro, H.



Abstract

Numerical calculations are presented for predicting the large positive magnetoresistance ratios R(B)/R(0) which are often observed in insulating materials. The magnetic field causes shrinkage of the localized electronic wave function, resulting in less overlapping between the hopping sites and hence a relatively large increase of the resistance in the insulating material. Two specific cases are ...

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