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The resistivity is calculated from geometric factors, the source current, and the voltage measurement. Along with a four-point collinear probe, the instrumentation used for this test includes a DC ...
Negative resistivity leads to positive resistance in the presence of a magnetic field - ScienceDaily
In the presence of a magnetic field, negative resistivity can produce a positive resistance, along with a sign reversal in the Hall effect, in GaAs/AlGaAs semiconductor devices.
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