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Updated: Feb 23, 2026

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
A new route to enhance the ferromagnetic transition temperature in diluted magnetic semiconductors
Kalpataru Pradhan1, Subrat K Das2
1CMP Division, Saha Institute of Nuclear Physics, HBNI, Kolkata, 700064, India. kalpataru.pradhan@saha.ac.in.
Abstract:
We investigate the magnetic and the transport properties of diluted magnetic semiconductors using a spin-fermion Monte-Carlo method on a simple cubic lattice in the intermediate coupling regime. The ferromagnetic transition temperature T c shows an optimization behavior with respect to the absolute carrier density p abs and the magnetic impurity concentration x as seen in the experiments. Our calculations also show an insulator-metal-insulator transition across the optimum p abs where the T c is maximum. Remarkably, the optimum p abs values lie in a narrow range around 0.11 (holes/site) for all x values and the ferromagnetic T c increases with x. We explain our results using the polaron percolation mechanism and outline a new route to enhance the ferromagnetic transition temperature in experiments.
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