Dear Colleagues,
Working with a composite material whose band gap is found to be 2.5 eV, the Hall effect experiment shows decrease in Hall voltage with increase in magnetic field.
Is it possible?
Please discuss.
Thanks and Regards
N Das
Is it possible you have both holes and electrons with different mobilities?
Also, working with any non-single-crystal, e.g. polycrystalline[1], or powdered[2], or diver composite semiconducting, materials, then several spurious[3] voltages, caused by various internal voltage (multi-ideal-)sources[1-3], may give rise to similar counterfeit/interference (or even this[4]) non-compensated evolution, 'measured' at the nominal Hall-voltage connections.
1. Electrical properties of grain boundaries in polycrystalline compound semiconductors https://iopscience.iop.org/article/10.1088/0268-1242/5/2/001
2. The Hall effect in polycrystalline and powdered semiconductors https://iopscience.iop.org/article/10.1088/0034-4885/43/11/001/pdf
3. Interference-voltage compensated Hall-effect device [DE4308375A1] https://worldwide.espacenet.com/patent/search/family/006482965/publication/DE4308375A1?q=pn%3DDE4308375
4. Observation/inventory within your Question, dear Nityananda Das https://www.researchgate.net/post/Is_it_possible_to_decrease_Hall_voltage_when_magnetic_field_is_increased
when the correlation between electrons varies it is possible to obtain this behavior
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