TY - JOUR

T1 - Numerical calculations for large positive magnetoresistance ratios R(B)/R(0) in insulating materials

AU - Rosenbaum, R.

AU - Castro, H.

AU - Schoepe, W.

N1 - Funding Information:
We thank the Tel Aviv University Internal Research Fund for the financial support.

PY - 2001/1

Y1 - 2001/1

N2 - 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 considered: (a) an insulating 3D sample that exhibits a `Mott' variable-range hopping law in its zero-field resistance and (b) an insulating 3D sample that exhibits an `Efros-Shklovskii' variable-range hopping law in its zero field resistance. The numerical calculations are tabulated. The general 3D `soft gap' case is also discussed.

AB - 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 considered: (a) an insulating 3D sample that exhibits a `Mott' variable-range hopping law in its zero-field resistance and (b) an insulating 3D sample that exhibits an `Efros-Shklovskii' variable-range hopping law in its zero field resistance. The numerical calculations are tabulated. The general 3D `soft gap' case is also discussed.

UR - http://www.scopus.com/inward/record.url?scp=0035062241&partnerID=8YFLogxK

U2 - 10.1016/S0921-4526(00)00706-7

DO - 10.1016/S0921-4526(00)00706-7

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AN - SCOPUS:0035062241

SN - 0921-4526

VL - 294-295

SP - 486

EP - 488

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

ER -