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- W2094039096 abstract "Barely insulating and barely metallic Si: As samples have been studied in the temperature range 4.2 K to 50 mK. Metallic samples show a new high-field magnetoresistance behavior explainable in terms of magnetic tuning of the critical density Nc. Insulating samples at fixed fields show Mott variable-range-hopping behavior and a strong increase in the characteristic temperature T0(N, H) with H. The ratio T0(N, H)/T0(N, 0) at fixed field shows quasicritical behavior increasing by a large field-dependent factor as N → Nc. Magnetocapacitance measurements on an 0.87Nc sample show an initial quadratic decrease with H followed by a flattening toward a linear decrease above 4 T. Both T0(N, H) and ε'(N, H) - εh can be explained in terms of the localization length decreasing with H, however the interpretation of the field-dependent decrease depends somewhat on the theoretical model employed. The decrease in ξ(N, H) cannot be explained in terms of Nc-tuning, but also seems to require some field-induced tuning in the localization length exponent which is qualitatively consistent with Hikani's theoretical prediction." @default.
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- W2094039096 date "1986-01-01" @default.
- W2094039096 modified "2023-09-27" @default.
- W2094039096 title "Magnetic Tuning of the Metal-Insulator Transition for Uncompensated Arsenic-Doped Silicon" @default.
- W2094039096 doi "https://doi.org/10.1088/0031-8949/1986/t14/022" @default.
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